diff --git a/build.bat b/build.bat
index d8a2ca72..d088335e 100644
--- a/build.bat
+++ b/build.bat
@@ -24,6 +24,7 @@ cd /D "%~dp0"
 ::
 :: - `asan`: enable address sanitizer
 :: - `telemetry`: enable RAD telemetry profiling support
+:: - `spall`: enable spall profiling support
 
 :: --- Unpack Arguments -------------------------------------------------------
 for %%a in (%*) do set "%%a=1"
@@ -39,6 +40,7 @@ if "%~1"=="release" if "%~2"=="" echo [default mode, assuming `raddbg` build] &&
 :: --- Unpack Command Line Build Arguments ------------------------------------
 set auto_compile_flags=
 if "%telemetry%"=="1" set auto_compile_flags=%auto_compile_flags% -DPROFILE_TELEMETRY=1 && echo [telemetry profiling enabled]
+if "%spall%"=="1"     set auto_compile_flags=%auto_compile_flags% -DPROFILE_SPALL=1 && echo [spall profiling enabled]
 if "%asan%"=="1"      set auto_compile_flags=%auto_compile_flags% -fsanitize=address && echo [asan enabled]
 if "%opengl%"=="1"    set auto_compile_flags=%auto_compile_flags% -DR_BACKEND=R_BACKEND_OPENGL && echo [opengl render backend]
 
diff --git a/project.4coder b/project.4coder
index 32a1e737..16c108c1 100644
--- a/project.4coder
+++ b/project.4coder
@@ -46,7 +46,7 @@ load_paths =
 commands =
 {
   //- rjf: [raddbg]
-  .f1 = { .win = "raddbg_stable --ipc kill_all && build raddbg telemetry", .linux = "", .out = "*compilation*", .footer_panel = true, .save_dirty_files = true, .cursor_at_end = false, },
+  .f1 = { .win = "raddbg_stable --ipc kill_all && build raddbg spall", .linux = "", .out = "*compilation*", .footer_panel = true, .save_dirty_files = true, .cursor_at_end = false, },
   
   //- rjf: [textperf]
   // .f1 = { .win = "raddbg_stable --ipc kill_all && build no_meta telemetry textperf && raddbg_stable --ipc bring_to_front && raddbg_stable --ipc run", .linux = "", .out = "*compilation*", .footer_panel = true, .save_dirty_files = true, .cursor_at_end = false, },
diff --git a/src/base/base_entry_point.c b/src/base/base_entry_point.c
index 6d489e66..b79c10c9 100644
--- a/src/base/base_entry_point.c
+++ b/src/base/base_entry_point.c
@@ -17,6 +17,11 @@ main_thread_base_entry_point(int arguments_count, char **arguments)
   tmInitialize(sizeof(tm_data), tm_data);
 #endif
   
+  //- rjf: set up spall
+#if PROFILE_SPALL
+  spall_profile = spall_init_file("spall_capture", 1);
+#endif
+  
   //- rjf: parse command line
   String8List command_line_argument_strings = os_string_list_from_argcv(scratch.arena, arguments_count, arguments);
   CmdLine cmdline = cmd_line_from_string_list(scratch.arena, command_line_argument_strings);
diff --git a/src/base/base_profile.c b/src/base/base_profile.c
index 8ac6bce5..03a8d523 100644
--- a/src/base/base_profile.c
+++ b/src/base/base_profile.c
@@ -1,2 +1,16 @@
 // Copyright (c) 2024 Epic Games Tools
 // Licensed under the MIT license (https://opensource.org/license/mit/)
+
+#if PROFILE_SPALL
+internal inline void
+spall_begin(char *fmt, ...)
+{
+  Temp scratch = scratch_begin(0, 0);
+  va_list args;
+  va_start(args, fmt);
+  String8 string = push_str8fv(scratch.arena, fmt, args);
+  spall_buffer_begin(&spall_profile, &spall_buffer, string.str, string.size, os_now_microseconds());
+  va_end(args);
+  scratch_end(scratch);
+}
+#endif
diff --git a/src/base/base_profile.h b/src/base/base_profile.h
index b39a2fc5..3981e365 100644
--- a/src/base/base_profile.h
+++ b/src/base/base_profile.h
@@ -10,6 +10,9 @@
 #if !defined(PROFILE_TELEMETRY)
 # define PROFILE_TELEMETRY 0
 #endif
+#if !defined(PROFILE_SPALL)
+# define PROFILE_SPALL 0
+#endif
 
 ////////////////////////////////
 //~ rjf: Third Party Includes
@@ -19,6 +22,8 @@
 # if OS_WINDOWS
 #  pragma comment(lib, "rad_tm_win64.lib")
 # endif
+#elif PROFILE_SPALL
+# include "spall.h"
 #endif
 
 ////////////////////////////////
@@ -61,6 +66,32 @@ scratch_end(scratch);                                                          \
 }
 #endif
 
+////////////////////////////////
+//~ rjf: Spall Profile Defines
+
+#if PROFILE_SPALL
+global U64 spall_capturing = 1;
+global SpallProfile spall_profile = {0};
+thread_static SpallBuffer spall_buffer = {0};
+internal inline void spall_begin(char *fmt, ...);
+# define ProfBegin(...)           (spall_capturing ? (spall_begin(__VA_ARGS__), 0) : 0)
+# define ProfBeginDynamic(...)    (spall_capturing ? (spall_begin(__VA_ARGS__), 0) : 0)
+# define ProfEnd(...)             (spall_capturing ? (spall_buffer_end(&spall_profile, &spall_buffer, os_now_microseconds())), 0 : 0)
+# define ProfTick(...)            
+# define ProfIsCapturing(...)     (!!spall_capturing)
+# define ProfBeginCapture(...)    (spall_capturing = 1)
+# define ProfEndCapture(...)      (spall_capturing = 0)
+# define ProfThreadName(...)
+# define ProfMsg(...)
+# define ProfBeginLockWait(...)
+# define ProfEndLockWait(...)
+# define ProfLockTake(...)
+# define ProfLockDrop(...)
+# define ProfColor(color)
+# define ProfBeginV(...)
+# define ProfNoteV(...)
+#endif
+
 ////////////////////////////////
 //~ rjf: Zeroify Undefined Defines
 
diff --git a/src/base/base_thread_context.c b/src/base/base_thread_context.c
index 1a3f84ed..897b8f2f 100644
--- a/src/base/base_thread_context.c
+++ b/src/base/base_thread_context.c
@@ -10,12 +10,19 @@ C_LINKAGE thread_static TCTX* tctx_thread_local = 0;
 #endif
 
 internal void
-tctx_init_and_equip(TCTX *tctx){
+tctx_init_and_equip(TCTX *tctx)
+{
   MemoryZeroStruct(tctx);
   Arena **arena_ptr = tctx->arenas;
-  for (U64 i = 0; i < ArrayCount(tctx->arenas); i += 1, arena_ptr += 1){
+  for(U64 i = 0; i < ArrayCount(tctx->arenas); i += 1, arena_ptr += 1)
+  {
     *arena_ptr = arena_alloc();
   }
+#if PROFILE_SPALL
+  spall_buffer.length = MB(1);
+  spall_buffer.data   = push_array_no_zero(tctx->arenas[0], U8, spall_buffer.length);
+  spall_buffer_init(&spall_profile, &spall_buffer);
+#endif
   tctx_thread_local = tctx;
 }
 
@@ -28,37 +35,42 @@ tctx_release(void)
   }
 }
 
-internal TCTX*
-tctx_get_equipped(void){
-  return(tctx_thread_local);
+internal TCTX *
+tctx_get_equipped(void)
+{
+  return tctx_thread_local;
 }
 
-internal Arena*
-tctx_get_scratch(Arena **conflicts, U64 count){
+internal Arena *
+tctx_get_scratch(Arena **conflicts, U64 count)
+{
   TCTX *tctx = tctx_get_equipped();
-  
   Arena *result = 0;
   Arena **arena_ptr = tctx->arenas;
-  for (U64 i = 0; i < ArrayCount(tctx->arenas); i += 1, arena_ptr += 1){
+  for(U64 i = 0; i < ArrayCount(tctx->arenas); i += 1, arena_ptr += 1)
+  {
     Arena **conflict_ptr = conflicts;
     B32 has_conflict = 0;
-    for (U64 j = 0; j < count; j += 1, conflict_ptr += 1){
-      if (*arena_ptr == *conflict_ptr){
+    for(U64 j = 0; j < count; j += 1, conflict_ptr += 1)
+    {
+      if(*arena_ptr == *conflict_ptr)
+      {
         has_conflict = 1;
         break;
       }
     }
-    if (!has_conflict){
+    if(!has_conflict)
+    {
       result = *arena_ptr;
       break;
     }
   }
-  
-  return(result);
+  return result;
 }
 
 internal void
-tctx_set_thread_name(String8 string){
+tctx_set_thread_name(String8 string)
+{
   TCTX *tctx = tctx_get_equipped();
   U64 size = ClampTop(string.size, sizeof(tctx->thread_name));
   MemoryCopy(tctx->thread_name, string.str, size);
@@ -66,21 +78,24 @@ tctx_set_thread_name(String8 string){
 }
 
 internal String8
-tctx_get_thread_name(void){
+tctx_get_thread_name(void)
+{
   TCTX *tctx = tctx_get_equipped();
   String8 result = str8(tctx->thread_name, tctx->thread_name_size);
-  return(result);
+  return result;
 }
 
 internal void
-tctx_write_srcloc(char *file_name, U64 line_number){
+tctx_write_srcloc(char *file_name, U64 line_number)
+{
   TCTX *tctx = tctx_get_equipped();
   tctx->file_name = file_name;
   tctx->line_number = line_number;
 }
 
 internal void
-tctx_read_srcloc(char **file_name, U64 *line_number){
+tctx_read_srcloc(char **file_name, U64 *line_number)
+{
   TCTX *tctx = tctx_get_equipped();
   *file_name = tctx->file_name;
   *line_number = tctx->line_number;
diff --git a/src/raddbg/raddbg_views.c b/src/raddbg/raddbg_views.c
index 80fd780b..54e16e5f 100644
--- a/src/raddbg/raddbg_views.c
+++ b/src/raddbg/raddbg_views.c
@@ -2591,7 +2591,7 @@ RD_VIEW_UI_FUNCTION_DEF(memory)
   Rng1S64 scroll_idx_rng = r1s64(0, (view_range_last - view_range.min) / num_columns);
   
   //////////////////////////////
-  //- rjf: determine visible range of rows
+  //- rjf: determine visible range of rows (including occluded)
   //
   Rng1S64 viz_range_rows = {0};
   S64 num_possible_visible_rows = 0;
@@ -2613,6 +2613,19 @@ RD_VIEW_UI_FUNCTION_DEF(memory)
   Rng2F32 footer_rect = r2f32p(0, panel_dim.y-footer_dim, panel_dim.x-scroll_bar_dim, panel_dim.y);
   Rng2F32 content_rect = r2f32p(0, row_height_px, panel_dim.x-scroll_bar_dim, panel_dim.y);
   
+  //////////////////////////////
+  //- rjf: determine visible range of rows (only non-occluded)
+  //
+  Rng1S64 viz_range_nonoccluded_rows = {0};
+  S64 num_possible_nonoccluded_visible_rows = 0;
+  {
+    num_possible_nonoccluded_visible_rows = (dim_2f32(content_rect).y - dim_2f32(footer_rect).y) / row_height_px;
+    viz_range_nonoccluded_rows.min = viz_range_rows.min + (S64)(content_rect.y0 / row_height_px);
+    viz_range_nonoccluded_rows.max = viz_range_nonoccluded_rows.min + num_possible_nonoccluded_visible_rows;
+    viz_range_nonoccluded_rows.min = clamp_1s64(scroll_idx_rng, viz_range_nonoccluded_rows.min);
+    viz_range_nonoccluded_rows.max = clamp_1s64(scroll_idx_rng, viz_range_nonoccluded_rows.max);
+  }
+  
   //////////////////////////////
   //- rjf: bump backwards if we are past the first
   if(viz_range_rows.min > 0)
@@ -2766,7 +2779,7 @@ RD_VIEW_UI_FUNCTION_DEF(memory)
   {
     mv->center_cursor = 0;
     S64 cursor_row_idx = (cursor_base_vaddr - view_range.min) / num_columns;
-    S64 new_idx = (cursor_row_idx-num_possible_visible_rows/2+1);
+    S64 new_idx = (cursor_row_idx-num_possible_nonoccluded_visible_rows/2+1);
     new_idx = clamp_1s64(scroll_idx_rng, new_idx);
     ui_scroll_pt_target_idx(&scroll_pos.y, new_idx);
   }
@@ -2779,8 +2792,8 @@ RD_VIEW_UI_FUNCTION_DEF(memory)
     mv->contain_cursor = 0;
     S64 cursor_row_idx = (cursor_base_vaddr - view_range.min) / num_columns;
     Rng1S64 cursor_viz_range = r1s64(clamp_1s64(scroll_idx_rng, cursor_row_idx-2), clamp_1s64(scroll_idx_rng, cursor_row_idx+3));
-    S64 min_delta = Min(0, cursor_viz_range.min-viz_range_rows.min);
-    S64 max_delta = Max(0, cursor_viz_range.max-viz_range_rows.max);
+    S64 min_delta = Min(0, cursor_viz_range.min-viz_range_nonoccluded_rows.min);
+    S64 max_delta = Max(0, cursor_viz_range.max-viz_range_nonoccluded_rows.max);
     S64 new_idx = scroll_pos.y.idx+min_delta+max_delta;
     new_idx = clamp_1s64(scroll_idx_rng, new_idx);
     ui_scroll_pt_target_idx(&scroll_pos.y, new_idx);