diff --git a/libxenia.vcxproj b/libxenia.vcxproj
index 2b0bfb2b1..0fa0d6a3c 100644
--- a/libxenia.vcxproj
+++ b/libxenia.vcxproj
@@ -25,6 +25,7 @@
     <ClCompile Include="src\xenia\apu\xaudio2\xaudio2_audio_driver.cc" />
     <ClCompile Include="src\xenia\apu\xaudio2\xaudio2_audio_system.cc" />
     <ClCompile Include="src\xenia\base\arena.cc" />
+    <ClCompile Include="src\xenia\base\clock.cc" />
     <ClCompile Include="src\xenia\base\debugging_win.cc" />
     <ClCompile Include="src\xenia\base\fs.cc" />
     <ClCompile Include="src\xenia\base\fs_win.cc" />
@@ -217,6 +218,7 @@
     <ClInclude Include="src\xenia\base\assert.h" />
     <ClInclude Include="src\xenia\base\atomic.h" />
     <ClInclude Include="src\xenia\base\byte_order.h" />
+    <ClInclude Include="src\xenia\base\clock.h" />
     <ClInclude Include="src\xenia\base\debugging.h" />
     <ClInclude Include="src\xenia\base\delegate.h" />
     <ClInclude Include="src\xenia\base\fs.h" />
diff --git a/libxenia.vcxproj.filters b/libxenia.vcxproj.filters
index b969ef749..a64a8f85f 100644
--- a/libxenia.vcxproj.filters
+++ b/libxenia.vcxproj.filters
@@ -706,6 +706,9 @@
     <ClCompile Include="src\xenia\apu\audio_decoder.cc">
       <Filter>src\xenia\apu</Filter>
     </ClCompile>
+    <ClCompile Include="src\xenia\base\clock.cc">
+      <Filter>src\xenia\base</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="src\xenia\emulator.h">
@@ -1362,6 +1365,9 @@
     <ClInclude Include="src\xenia\base\mutex.h">
       <Filter>src\xenia\base</Filter>
     </ClInclude>
+    <ClInclude Include="src\xenia\base\clock.h">
+      <Filter>src\xenia\base</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <None Include="src\xenia\cpu\backend\x64\x64_sequence.inl">
diff --git a/src/xenia/base/clock.cc b/src/xenia/base/clock.cc
new file mode 100644
index 000000000..78f922b3b
--- /dev/null
+++ b/src/xenia/base/clock.cc
@@ -0,0 +1,96 @@
+/**
+ ******************************************************************************
+ * Xenia : Xbox 360 Emulator Research Project                                 *
+ ******************************************************************************
+ * Copyright 2015 Ben Vanik. All rights reserved.                             *
+ * Released under the BSD license - see LICENSE in the root for more details. *
+ ******************************************************************************
+ */
+
+#include "xenia/base/clock.h"
+
+#include "xenia/base/platform.h"
+
+namespace xe {
+
+double guest_time_scalar_ = 1.0;
+uint64_t guest_tick_frequency_ = Clock::host_tick_frequency();
+uint64_t guest_system_time_base_ = Clock::QueryHostSystemTime();
+
+uint64_t Clock::host_tick_frequency() {
+  static LARGE_INTEGER frequency = {0};
+  if (!frequency.QuadPart) {
+    QueryPerformanceFrequency(&frequency);
+  }
+  return frequency.QuadPart;
+}
+
+uint64_t Clock::QueryHostTickCount() {
+  LARGE_INTEGER counter;
+  uint64_t time = 0;
+  if (QueryPerformanceCounter(&counter)) {
+    time = counter.QuadPart;
+  }
+  return time;
+}
+
+uint64_t Clock::QueryHostSystemTime() {
+  FILETIME t;
+  GetSystemTimeAsFileTime(&t);
+  return (uint64_t(t.dwHighDateTime) << 32) | t.dwLowDateTime;
+}
+
+uint32_t Clock::QueryHostUptimeMillis() { return ::GetTickCount(); }
+
+double Clock::guest_time_scalar() { return guest_time_scalar_; }
+
+void Clock::set_guest_time_scalar(double scalar) {
+  guest_time_scalar_ = scalar;
+}
+
+uint64_t Clock::guest_tick_frequency() { return guest_tick_frequency_; }
+
+void Clock::set_guest_tick_frequency(uint64_t frequency) {
+  guest_tick_frequency_ = frequency;
+}
+
+uint64_t Clock::guest_system_time_base() { return guest_system_time_base_; }
+
+void Clock::set_guest_system_time_base(uint64_t time_base) {
+  guest_system_time_base_ = time_base;
+}
+
+uint64_t Clock::QueryGuestTickCount() {
+  // TODO(benvanik): adjust.
+  return QueryHostTickCount();
+}
+
+uint64_t Clock::QueryGuestSystemTime() {
+  // TODO(benvanik): adjust.
+  return QueryHostSystemTime();
+}
+
+uint32_t Clock::QueryGuestUptimeMillis() {
+  // TODO(benvanik): adjust.
+  return QueryHostUptimeMillis();
+}
+
+uint32_t Clock::ScaleGuestDurationMillis(uint32_t guest_ms) {
+  // TODO(benvanik): adjust.
+  // if -1, return -1
+  // if 0, return 0
+  return guest_ms;
+}
+
+int64_t Clock::ScaleGuestDurationFileTime(int64_t guest_file_time) {
+  // TODO(benvanik): adjust.
+  // negative = relative times
+  // positive = absolute times
+  return guest_file_time;
+}
+
+void Clock::ScaleGuestDurationTimeval(long* tv_sec, long* tv_usec) {
+  // TODO(benvanik): adjust.
+}
+
+}  // namespace xe
diff --git a/src/xenia/base/clock.h b/src/xenia/base/clock.h
new file mode 100644
index 000000000..31ae5a288
--- /dev/null
+++ b/src/xenia/base/clock.h
@@ -0,0 +1,60 @@
+/**
+ ******************************************************************************
+ * Xenia : Xbox 360 Emulator Research Project                                 *
+ ******************************************************************************
+ * Copyright 2015 Ben Vanik. All rights reserved.                             *
+ * Released under the BSD license - see LICENSE in the root for more details. *
+ ******************************************************************************
+ */
+
+#ifndef XENIA_BASE_CLOCK_H_
+#define XENIA_BASE_CLOCK_H_
+
+#include <cstdint>
+
+namespace xe {
+
+class Clock {
+ public:
+  // Host ticks-per-second.
+  static uint64_t host_tick_frequency();
+  // Queries the current host tick count.
+  static uint64_t QueryHostTickCount();
+  // Host time, in FILETIME format.
+  static uint64_t QueryHostSystemTime();
+  // Queries the milliseconds since the host began.
+  static uint32_t QueryHostUptimeMillis();
+
+  // Guest time scalar.
+  static double guest_time_scalar();
+  // Sets the guest time scalar, adjusting tick and wall clock speed.
+  // Ex: 1x=normal, 2x=double speed, 1/2x=half speed.
+  static void set_guest_time_scalar(double scalar);
+  // Guest ticks-per-second.
+  static uint64_t guest_tick_frequency();
+  // Sets the guest ticks-per-second.
+  static void set_guest_tick_frequency(uint64_t frequency);
+  // Time based used for the guest system time.
+  static uint64_t guest_system_time_base();
+  // Sets the guest time base, used for computing the system time.
+  // By default this is the current system time.
+  static void set_guest_system_time_base(uint64_t time_base);
+  // Queries the current guest tick count, accounting for frequency adjustment
+  // and scaling.
+  static uint64_t QueryGuestTickCount();
+  // Queries the guest time, in FILETIME format, accounting for scaling.
+  static uint64_t QueryGuestSystemTime();
+  // Queries the milliseconds since the guest began, accounting for scaling.
+  static uint32_t QueryGuestUptimeMillis();
+
+  // Scales a time duration in milliseconds, from guest time.
+  static uint32_t ScaleGuestDurationMillis(uint32_t guest_ms);
+  // Scales a time duration in 100ns ticks like FILETIME, from guest time.
+  static int64_t ScaleGuestDurationFileTime(int64_t guest_file_time);
+  // Scales a time duration represented as a timeval, from guest time.
+  static void ScaleGuestDurationTimeval(long* tv_sec, long* tv_usec);
+};
+
+}  // namespace xe
+
+#endif  // XENIA_BASE_CLOCK_H_
diff --git a/src/xenia/base/threading.h b/src/xenia/base/threading.h
index da2b7bee5..345dc14ab 100644
--- a/src/xenia/base/threading.h
+++ b/src/xenia/base/threading.h
@@ -43,10 +43,6 @@ class Fence {
   std::atomic<bool> signaled_;
 };
 
-// Gets the current high-performance tick count.
-uint64_t ticks();
-uint64_t ticks_per_second();
-
 // TODO(benvanik): processor info API.
 
 // Gets a stable thread-specific ID, but may not be. Use for informative
diff --git a/src/xenia/base/threading_win.cc b/src/xenia/base/threading_win.cc
index 342fbb7de..f8546f099 100644
--- a/src/xenia/base/threading_win.cc
+++ b/src/xenia/base/threading_win.cc
@@ -14,23 +14,6 @@
 namespace xe {
 namespace threading {
 
-uint64_t ticks() {
-  LARGE_INTEGER counter;
-  uint64_t time = 0;
-  if (QueryPerformanceCounter(&counter)) {
-    time = counter.QuadPart;
-  }
-  return time;
-}
-
-uint64_t ticks_per_second() {
-  static LARGE_INTEGER freq = {0};
-  if (!freq.QuadPart) {
-    QueryPerformanceFrequency(&freq);
-  }
-  return freq.QuadPart;
-}
-
 uint32_t current_thread_id() {
   return static_cast<uint32_t>(GetCurrentThreadId());
 }
diff --git a/src/xenia/cpu/backend/x64/x64_sequences.cc b/src/xenia/cpu/backend/x64/x64_sequences.cc
index 9eb4cb074..a3fc19ba1 100644
--- a/src/xenia/cpu/backend/x64/x64_sequences.cc
+++ b/src/xenia/cpu/backend/x64/x64_sequences.cc
@@ -25,6 +25,7 @@
 #include "xenia/cpu/backend/x64/x64_sequences.h"
 
 #include "xenia/base/assert.h"
+#include "xenia/base/clock.h"
 #include "xenia/base/logging.h"
 #include "xenia/base/threading.h"
 #include "xenia/cpu/backend/x64/x64_emitter.h"
@@ -1086,7 +1087,7 @@ EMITTER(LOAD_CLOCK, MATCH(I<OPCODE_LOAD_CLOCK, I64<>>)) {
     e.mov(i.dest, e.rax);
   }
   static uint64_t LoadClock(void* raw_context) {
-    return xe::threading::ticks();
+    return Clock::QueryGuestTickCount();
   }
 };
 EMITTER_OPCODE_TABLE(
diff --git a/src/xenia/emulator.cc b/src/xenia/emulator.cc
index 324966cd4..0de7c9fab 100644
--- a/src/xenia/emulator.cc
+++ b/src/xenia/emulator.cc
@@ -9,8 +9,11 @@
 
 #include "xenia/emulator.h"
 
+#include <gflags/gflags.h>
+
 #include "xenia/apu/apu.h"
 #include "xenia/base/assert.h"
+#include "xenia/base/clock.h"
 #include "xenia/base/string.h"
 #include "xenia/cpu/cpu.h"
 #include "xenia/gpu/gpu.h"
@@ -22,6 +25,9 @@
 #include "xenia/memory.h"
 #include "xenia/ui/main_window.h"
 
+DEFINE_double(time_scalar, 1.0,
+              "Scalar used to speed or slow time (1x, 2x, 1/2x, etc).");
+
 namespace xe {
 
 using namespace xe::apu;
@@ -64,6 +70,16 @@ Emulator::~Emulator() {
 X_STATUS Emulator::Setup() {
   X_STATUS result = X_STATUS_UNSUCCESSFUL;
 
+  // Initialize clock.
+  // 360 uses a 50MHz clock.
+  // Clock::set_guest_tick_frequency(50000000);
+  // We could reset this with save state data/constant value to help replays.
+  Clock::set_guest_system_time_base(Clock::QueryHostSystemTime());
+  // This can be adjusted dynamically, as well.
+  Clock::set_guest_time_scalar(FLAGS_time_scalar);
+
+  // Before we can set thread affinity we must enable the process to use all
+  // logical processors.
   HANDLE process_handle = GetCurrentProcess();
   DWORD_PTR process_affinity_mask;
   DWORD_PTR system_affinity_mask;
diff --git a/src/xenia/gpu/gl4/command_processor.cc b/src/xenia/gpu/gl4/command_processor.cc
index 84eb3788a..c4bea0187 100644
--- a/src/xenia/gpu/gl4/command_processor.cc
+++ b/src/xenia/gpu/gl4/command_processor.cc
@@ -59,7 +59,6 @@ CommandProcessor::CommandProcessor(GL4GraphicsSystem* graphics_system)
       trace_state_(TraceState::kDisabled),
       worker_running_(true),
       swap_mode_(SwapMode::kNormal),
-      time_base_(0),
       counter_(0),
       primary_buffer_ptr_(0),
       primary_buffer_size_(0),
@@ -83,19 +82,10 @@ CommandProcessor::CommandProcessor(GL4GraphicsSystem* graphics_system)
       draw_index_count_(0),
       draw_batcher_(graphics_system_->register_file()),
       scratch_buffer_(kScratchBufferCapacity, kScratchBufferAlignment) {
-  LARGE_INTEGER perf_counter;
-  QueryPerformanceCounter(&perf_counter);
-  time_base_ = perf_counter.QuadPart;
 }
 
 CommandProcessor::~CommandProcessor() { CloseHandle(write_ptr_index_event_); }
 
-uint64_t CommandProcessor::QueryTime() {
-  LARGE_INTEGER perf_counter;
-  QueryPerformanceCounter(&perf_counter);
-  return perf_counter.QuadPart - time_base_;
-}
-
 bool CommandProcessor::Initialize(std::unique_ptr<GLContext> context) {
   context_ = std::move(context);
 
diff --git a/src/xenia/gpu/gl4/command_processor.h b/src/xenia/gpu/gl4/command_processor.h
index 2f1b782cc..780244cb6 100644
--- a/src/xenia/gpu/gl4/command_processor.h
+++ b/src/xenia/gpu/gl4/command_processor.h
@@ -62,7 +62,6 @@ class CommandProcessor {
   typedef std::function<void(const SwapParameters& params)> SwapHandler;
   void set_swap_handler(SwapHandler fn) { swap_handler_ = fn; }
 
-  uint64_t QueryTime();
   uint32_t counter() const { return counter_; }
   void increment_counter() { counter_++; }
 
@@ -243,7 +242,6 @@ class CommandProcessor {
 
   SwapMode swap_mode_;
 
-  uint64_t time_base_;
   uint32_t counter_;
 
   uint32_t primary_buffer_ptr_;
diff --git a/src/xenia/gpu/gl4/gl4_graphics_system.cc b/src/xenia/gpu/gl4/gl4_graphics_system.cc
index 072a2aa23..1ab109e10 100644
--- a/src/xenia/gpu/gl4/gl4_graphics_system.cc
+++ b/src/xenia/gpu/gl4/gl4_graphics_system.cc
@@ -9,6 +9,7 @@
 
 #include "xenia/gpu/gl4/gl4_graphics_system.h"
 
+#include "xenia/base/clock.h"
 #include "xenia/base/logging.h"
 #include "xenia/base/threading.h"
 #include "xenia/cpu/processor.h"
@@ -86,11 +87,11 @@ X_STATUS GL4GraphicsSystem::Setup(cpu::Processor* processor,
       kernel::object_ref<kernel::XHostThread>(new kernel::XHostThread(
           emulator()->kernel_state(), 128 * 1024, 0, [this]() {
             uint64_t vsync_duration = FLAGS_vsync ? 16 : 1;
-            uint64_t last_frame_time = xe::threading::ticks();
+            uint64_t last_frame_time = Clock::QueryGuestTickCount();
             while (worker_running_) {
-              uint64_t current_time = xe::threading::ticks();
+              uint64_t current_time = Clock::QueryGuestTickCount();
               uint64_t elapsed = (current_time - last_frame_time) /
-                                 (xe::threading::ticks_per_second() / 1000);
+                                 (Clock::guest_tick_frequency() / 1000);
               if (elapsed >= vsync_duration) {
                 MarkVblank();
                 last_frame_time = current_time;
diff --git a/src/xenia/gpu/xe-gpu-trace-viewer.cc b/src/xenia/gpu/xe-gpu-trace-viewer.cc
index 5ca724c4d..9c5c06d79 100644
--- a/src/xenia/gpu/xe-gpu-trace-viewer.cc
+++ b/src/xenia/gpu/xe-gpu-trace-viewer.cc
@@ -11,6 +11,7 @@
 
 #include "third_party/imgui/imgui.h"
 
+#include "xenia/base/clock.h"
 #include "xenia/base/logging.h"
 #include "xenia/base/main.h"
 #include "xenia/base/mapped_memory.h"
@@ -2272,10 +2273,10 @@ int trace_viewer_main(std::vector<std::wstring>& args) {
         imgui_setup = true;
       }
       auto& io = ImGui::GetIO();
-      auto current_ticks = xe::threading::ticks();
+      auto current_ticks = Clock::QueryHostTickCount();
       static uint64_t last_ticks = 0;
-      io.DeltaTime = (current_ticks - last_ticks) /
-                     float(xe::threading::ticks_per_second());
+      io.DeltaTime =
+          (current_ticks - last_ticks) / float(Clock::host_tick_frequency());
       last_ticks = current_ticks;
 
       io.DisplaySize =
diff --git a/src/xenia/kernel/objects/xthread.cc b/src/xenia/kernel/objects/xthread.cc
index a38fe5fb7..6eb162f75 100644
--- a/src/xenia/kernel/objects/xthread.cc
+++ b/src/xenia/kernel/objects/xthread.cc
@@ -11,6 +11,7 @@
 
 #include <gflags/gflags.h>
 
+#include "xenia/base/clock.h"
 #include "xenia/base/logging.h"
 #include "xenia/base/math.h"
 #include "xenia/base/mutex.h"
@@ -236,10 +237,7 @@ X_STATUS XThread::Create() {
   xe::store_and_swap<uint32_t>(p + 0x09C, 0xFDFFD7FF);
   xe::store_and_swap<uint32_t>(
       p + 0x0D0, thread_state_->stack_address() + thread_state_->stack_size());
-  FILETIME t;
-  GetSystemTimeAsFileTime(&t);
-  xe::store_and_swap<uint64_t>(
-      p + 0x130, ((uint64_t)t.dwHighDateTime << 32) | t.dwLowDateTime);
+  xe::store_and_swap<uint64_t>(p + 0x130, Clock::QueryGuestSystemTime());
   xe::store_and_swap<uint32_t>(p + 0x144, thread_state_address_ + 0x144);
   xe::store_and_swap<uint32_t>(p + 0x148, thread_state_address_ + 0x144);
   xe::store_and_swap<uint32_t>(p + 0x14C, thread_id_);
@@ -621,6 +619,7 @@ X_STATUS XThread::Delay(uint32_t processor_mode, uint32_t alertable,
   } else {
     timeout_ms = 0;
   }
+  timeout_ms = Clock::ScaleGuestDurationMillis(timeout_ms);
   DWORD result = SleepEx(timeout_ms, alertable ? TRUE : FALSE);
   switch (result) {
     case 0:
diff --git a/src/xenia/kernel/objects/xtimer.cc b/src/xenia/kernel/objects/xtimer.cc
index f96680fc1..fdab85f73 100644
--- a/src/xenia/kernel/objects/xtimer.cc
+++ b/src/xenia/kernel/objects/xtimer.cc
@@ -9,6 +9,7 @@
 
 #include "xenia/kernel/objects/xtimer.h"
 
+#include "xenia/base/clock.h"
 #include "xenia/base/logging.h"
 #include "xenia/cpu/processor.h"
 
@@ -49,6 +50,9 @@ X_STATUS XTimer::SetTimer(int64_t due_time, uint32_t period_ms,
   current_routine_ = routine;
   current_routine_arg_ = routine_arg;
 
+  due_time = Clock::ScaleGuestDurationFileTime(due_time);
+  period_ms = Clock::ScaleGuestDurationMillis(period_ms);
+
   LARGE_INTEGER due_time_li;
   due_time_li.QuadPart = due_time;
   BOOL result =
diff --git a/src/xenia/kernel/xam_net.cc b/src/xenia/kernel/xam_net.cc
index 3c8e50fd5..8f3df0ada 100644
--- a/src/xenia/kernel/xam_net.cc
+++ b/src/xenia/kernel/xam_net.cc
@@ -10,6 +10,7 @@
 #define _WINSOCK_DEPRECATED_NO_WARNINGS  // inet_addr
 #include <winsock2.h>
 
+#include "xenia/base/clock.h"
 #include "xenia/base/logging.h"
 #include "xenia/kernel/kernel_state.h"
 #include "xenia/kernel/util/shim_utils.h"
@@ -373,6 +374,7 @@ SHIM_CALL NetDll_select_shim(PPCContext* ppc_state, KernelState* state) {
   if (timeout_ptr) {
     timeout = {static_cast<long>(SHIM_MEM_32(timeout_ptr + 0)),
                static_cast<long>(SHIM_MEM_32(timeout_ptr + 4))};
+    Clock::ScaleGuestDurationTimeval(&timeout.tv_sec, &timeout.tv_usec);
     timeout_in = &timeout;
   }
   int ret = select(nfds, readfds_ptr ? &readfds : nullptr,
diff --git a/src/xenia/kernel/xboxkrnl_module.cc b/src/xenia/kernel/xboxkrnl_module.cc
index b42ff95f8..5fcea5ac1 100644
--- a/src/xenia/kernel/xboxkrnl_module.cc
+++ b/src/xenia/kernel/xboxkrnl_module.cc
@@ -11,6 +11,7 @@
 
 #include <gflags/gflags.h>
 
+#include "xenia/base/clock.h"
 #include "xenia/base/logging.h"
 #include "xenia/base/math.h"
 #include "xenia/emulator.h"
@@ -133,13 +134,15 @@ XboxkrnlModule::XboxkrnlModule(Emulator* emulator, KernelState* kernel_state)
       "xboxkrnl.exe", ordinals::KeTimeStampBundle, pKeTimeStampBundle);
   xe::store_and_swap<uint64_t>(lpKeTimeStampBundle + 0, 0);
   xe::store_and_swap<uint64_t>(lpKeTimeStampBundle + 8, 0);
-  xe::store_and_swap<uint32_t>(lpKeTimeStampBundle + 16, GetTickCount());
+  xe::store_and_swap<uint32_t>(lpKeTimeStampBundle + 16,
+                               Clock::QueryGuestUptimeMillis());
   xe::store_and_swap<uint32_t>(lpKeTimeStampBundle + 20, 0);
   CreateTimerQueueTimer(
       &timestamp_timer_, nullptr,
       [](PVOID param, BOOLEAN timer_or_wait_fired) {
         auto timestamp_bundle = reinterpret_cast<uint8_t*>(param);
-        xe::store_and_swap<uint32_t>(timestamp_bundle + 16, GetTickCount());
+        xe::store_and_swap<uint32_t>(timestamp_bundle + 16,
+                                     Clock::QueryGuestUptimeMillis());
       },
       lpKeTimeStampBundle, 0,
       1,  // 1ms
diff --git a/src/xenia/kernel/xboxkrnl_threading.cc b/src/xenia/kernel/xboxkrnl_threading.cc
index 0246833e4..71ec69721 100644
--- a/src/xenia/kernel/xboxkrnl_threading.cc
+++ b/src/xenia/kernel/xboxkrnl_threading.cc
@@ -8,6 +8,7 @@
  */
 
 #include "xenia/base/atomic.h"
+#include "xenia/base/clock.h"
 #include "xenia/base/logging.h"
 #include "xenia/base/mutex.h"
 #include "xenia/cpu/processor.h"
@@ -312,13 +313,7 @@ SHIM_CALL KeQueryPerformanceFrequency_shim(PPCContext* ppc_state,
   // XELOGD(
   //     "KeQueryPerformanceFrequency()");
 
-  // TODO(benvanik): return fixed 50000000?
-
-  uint64_t result = 0;
-  LARGE_INTEGER frequency;
-  if (QueryPerformanceFrequency(&frequency)) {
-    result = frequency.QuadPart;
-  }
+  uint64_t result = Clock::guest_tick_frequency();
   SHIM_SET_RETURN_64(result);
 }
 
@@ -351,9 +346,7 @@ SHIM_CALL KeQuerySystemTime_shim(PPCContext* ppc_state, KernelState* state) {
 
   XELOGD("KeQuerySystemTime(%.8X)", time_ptr);
 
-  FILETIME t;
-  GetSystemTimeAsFileTime(&t);
-  uint64_t time = ((uint64_t)t.dwHighDateTime << 32) | t.dwLowDateTime;
+  uint64_t time = Clock::QueryGuestSystemTime();
 
   if (time_ptr) {
     SHIM_SET_MEM_64(time_ptr, time);
diff --git a/src/xenia/kernel/xobject.cc b/src/xenia/kernel/xobject.cc
index e6a7c69d9..1f6ad8d7a 100644
--- a/src/xenia/kernel/xobject.cc
+++ b/src/xenia/kernel/xobject.cc
@@ -9,6 +9,7 @@
 
 #include "xenia/kernel/xobject.h"
 
+#include "xenia/base/clock.h"
 #include "xenia/kernel/kernel_state.h"
 #include "xenia/kernel/objects/xevent.h"
 #include "xenia/kernel/objects/xmutant.h"
@@ -109,6 +110,7 @@ X_STATUS XObject::Wait(uint32_t wait_reason, uint32_t processor_mode,
   }
 
   DWORD timeout_ms = opt_timeout ? TimeoutTicksToMs(*opt_timeout) : INFINITE;
+  timeout_ms = Clock::ScaleGuestDurationMillis(timeout_ms);
 
   DWORD result = WaitForSingleObjectEx(wait_handle, timeout_ms, alertable);
   switch (result) {
@@ -131,6 +133,7 @@ X_STATUS XObject::SignalAndWait(XObject* signal_object, XObject* wait_object,
                                 uint32_t wait_reason, uint32_t processor_mode,
                                 uint32_t alertable, uint64_t* opt_timeout) {
   DWORD timeout_ms = opt_timeout ? TimeoutTicksToMs(*opt_timeout) : INFINITE;
+  timeout_ms = Clock::ScaleGuestDurationMillis(timeout_ms);
 
   DWORD result = SignalObjectAndWait(signal_object->GetWaitHandle(),
                                      wait_object->GetWaitHandle(), timeout_ms,
@@ -150,6 +153,7 @@ X_STATUS XObject::WaitMultiple(uint32_t count, XObject** objects,
   }
 
   DWORD timeout_ms = opt_timeout ? TimeoutTicksToMs(*opt_timeout) : INFINITE;
+  timeout_ms = Clock::ScaleGuestDurationMillis(timeout_ms);
 
   DWORD result = WaitForMultipleObjectsEx(
       count, wait_handles, wait_type ? FALSE : TRUE, timeout_ms, alertable);
diff --git a/src/xenia/memory.cc b/src/xenia/memory.cc
index dc6c7e133..5a74f7649 100644
--- a/src/xenia/memory.cc
+++ b/src/xenia/memory.cc
@@ -14,6 +14,7 @@
 #include <algorithm>
 #include <mutex>
 
+#include "xenia/base/clock.h"
 #include "xenia/base/logging.h"
 #include "xenia/base/math.h"
 #include "xenia/base/threading.h"
@@ -114,7 +115,7 @@ Memory::~Memory() {
 
 int Memory::Initialize() {
   wchar_t file_name[256];
-  wsprintf(file_name, L"Local\\xenia_memory_%p", xe::threading::ticks());
+  wsprintf(file_name, L"Local\\xenia_memory_%p", Clock::QueryHostTickCount());
   file_name_ = file_name;
 
 // Create main page file-backed mapping. This is all reserved but