diff --git a/examples/test262/index.js b/examples/test262/index.js
index ec6df26..80b5960 100755
--- a/examples/test262/index.js
+++ b/examples/test262/index.js
@@ -58,6 +58,7 @@ let state = {
   memoryOffset: 0,
   memoryStatus: '',
   memoryStatusAt: 0,
+  fullClearNextRender: false,
   searchMode: false,
   searchQuery: ''
 };
@@ -123,6 +124,8 @@ const byteStatSuffixes = new Set([
   'bytes',
   'cstack',
   'rss',
+  'residentSize',
+  'physFootprint',
   'virtualSize'
 ]);
 
@@ -210,6 +213,40 @@ function ensureMemoryCache() {
   return state.memoryCache;
 }
 
+function hasGcMarkProfileControls() {
+  return Ant.raw
+    && typeof Ant.raw.gcMarkProfile === 'function'
+    && typeof Ant.raw.gcMarkProfileEnable === 'function'
+    && typeof Ant.raw.gcMarkProfileReset === 'function';
+}
+
+function toggleGcMarkProfile() {
+  if (!hasGcMarkProfileControls()) {
+    setMemoryStatus(`${c.red}GC mark profiler unavailable${c.reset}`);
+    return false;
+  }
+
+  const current = Ant.raw.gcMarkProfile();
+  const enabled = Ant.raw.gcMarkProfileEnable(!current.enabled);
+  refreshMemoryCache();
+  setMemoryStatus(enabled
+    ? `${c.green}GC mark profiler enabled${c.reset}`
+    : `${c.yellow}GC mark profiler disabled${c.reset}`);
+  return true;
+}
+
+function resetGcMarkProfile() {
+  if (!hasGcMarkProfileControls()) {
+    setMemoryStatus(`${c.red}GC mark profiler unavailable${c.reset}`);
+    return false;
+  }
+
+  Ant.raw.gcMarkProfileReset();
+  refreshMemoryCache();
+  setMemoryStatus(`${c.green}GC mark profiler reset${c.reset}`);
+  return true;
+}
+
 function memoryStatusText() {
   if (!state.memoryStatus) return '';
   if (Date.now() - state.memoryStatusAt > 4000) {
@@ -361,7 +398,7 @@ function buildScreen() {
     lines.push(' '.repeat(cols));
     const status = memoryStatusText();
     lines.push(pad(
-      `${c.dim}↑↓ scroll · PgUp/PgDn · g/G top/bottom · r refresh · c copy · m browse · q quit${c.reset}  ${c.dim}[${state.memoryOffset + 1}-${end}/${memoryLines.length}]${c.reset}  ${status}${status ? '  ' : ''}${c.cyan}${fps.current} fps${c.reset}`,
+      `${c.dim}↑↓ scroll · PgUp/PgDn · g/G top/bottom · r refresh · e profiler · R reset profiler · c copy · m browse · q quit${c.reset}  ${c.dim}[${state.memoryOffset + 1}-${end}/${memoryLines.length}]${c.reset}  ${status}${status ? '  ' : ''}${c.cyan}${fps.current} fps${c.reset}`,
       cols
     ));
     linesArePadded = true;
@@ -374,7 +411,9 @@ function render() {
   if (pendingRender) return;
   fps.update();
   const screen = buildScreen();
-  const ok = process.stdout.write(`${term.syncStart}${term.hideCursor}${term.home}${screen}${term.syncEnd}`);
+  const clear = state.fullClearNextRender ? term.clearScreen : '';
+  state.fullClearNextRender = false;
+  const ok = process.stdout.write(`${term.syncStart}${term.hideCursor}${term.home}${clear}${screen}${term.syncEnd}`);
   if (!ok) pendingRender = true;
 }
 
@@ -503,6 +542,7 @@ function handleKey(key) {
         state.mode = 'browse';
       } else {
         state.mode = 'memory';
+        state.fullClearNextRender = true;
         state.memoryOffset = 0;
         refreshMemoryCache();
         setMemoryStatus(`${c.green}Refreshed memory stats${c.reset}`);
@@ -516,6 +556,16 @@ function handleKey(key) {
         needsRender = true;
       }
       break;
+    case 'e':
+      if (state.mode === 'memory') {
+        needsRender = toggleGcMarkProfile() || needsRender;
+      }
+      break;
+    case 'R':
+      if (state.mode === 'memory') {
+        needsRender = resetGcMarkProfile() || needsRender;
+      }
+      break;
     case 'c':
       if (state.mode === 'memory') {
         copyMemoryStats();
diff --git a/examples/tui/index.js b/examples/tui/index.js
index cb7f509..42b8556 100644
--- a/examples/tui/index.js
+++ b/examples/tui/index.js
@@ -1,20 +1,4 @@
-import {
-  Screen,
-  List,
-  ProgressBar,
-  Input,
-  Table,
-  colors,
-  box,
-  keys,
-  codes,
-  modal,
-  confirm,
-  pad,
-  padCenter,
-  truncate,
-  visibleLength
-} from './tuey.js';
+import { Screen, List, ProgressBar, Input, colors, box, keys, codes, modal, confirm, pad, padCenter, truncate, visibleLength } from './tuey.js';
 
 const screen = new Screen({ fullscreen: true, hideCursor: true });
 
@@ -386,11 +370,12 @@ function showMemoryModal() {
     if (bytes < 1024 * 1024) return (bytes / 1024).toFixed(2) + ' KB';
     return (bytes / 1024 / 1024).toFixed(2) + ' MB';
   };
+  const fmtMaybe = value => (typeof value === 'number' ? fmt(value) : 'n/a');
 
   modal(screen, {
     id: 'memory',
     width: 40,
-    height: 10,
+    height: 11,
     title: 'Memory Usage',
     titleStyle: colors.bold + colors.yellow,
     borderStyle: box.rounded,
@@ -408,7 +393,9 @@ function showMemoryModal() {
       buf.writeStyled(ox, oy + y++, `  Pools:    ${colors.bold}${fmt(mem.pools.totalUsed)} / ${fmt(mem.pools.totalCapacity)}${codes.reset}`);
       buf.writeStyled(ox, oy + y++, `  Alloc:    ${colors.bold}${fmt(mem.alloc.total)}${codes.reset}  (${mem.alloc.objectCount} objects)`);
       buf.writeStyled(ox, oy + y++, `  External: ${colors.bold}${fmt(mem.external.total)}${codes.reset}`);
-      buf.writeStyled(ox, oy + y++, `  RSS:      ${colors.bold}${fmt(mem.rss)}${codes.reset}`);
+      buf.writeStyled(ox, oy + y++, `  RSS:      ${colors.bold}${fmtMaybe(mem.rss)}${codes.reset}`);
+      buf.writeStyled(ox, oy + y++, `  Resident: ${colors.bold}${fmtMaybe(mem.residentSize)}${codes.reset}`);
+      buf.writeStyled(ox, oy + y++, `  Footprint:${colors.bold}${fmtMaybe(mem.physFootprint)}${codes.reset}`);
       y++;
 
       buf.writeStyled(ox, oy + y, colors.dim + '  m/Esc: Close' + codes.reset);
@@ -613,7 +600,7 @@ function handleKey(key) {
             }
             return false;
           },
-          render: (buf, w, h, ox, oy) => {
+          render: (buf, _w, _h, ox, oy) => {
             buf.writeStyled(ox, oy + 1, ' Name: ' + nameInput.render());
             buf.writeStyled(ox, oy + 3, colors.dim + ' Enter: Save  Esc: Cancel' + codes.reset);
           }
diff --git a/src/modules/builtin.c b/src/modules/builtin.c
index 7209e0a..28a6215 100644
--- a/src/modules/builtin.c
+++ b/src/modules/builtin.c
@@ -319,9 +319,19 @@ static ant_value_t js_stats_fn(ant_t *js, ant_value_t *args, int nargs) {
   struct mach_task_basic_info info;
   mach_msg_type_number_t count = MACH_TASK_BASIC_INFO_COUNT;
   if (task_info(mach_task_self(), MACH_TASK_BASIC_INFO, (task_info_t)&info, &count) == KERN_SUCCESS) {
-    js_set(js, result, "rss", js_mknum((double)info.resident_size));
+    js_set(js, result, "residentSize", js_mknum((double)info.resident_size));
     js_set(js, result, "virtualSize", js_mknum((double)info.virtual_size));
   }
+
+  task_vm_info_data_t vm_info;
+  mach_msg_type_number_t vm_count = TASK_VM_INFO_COUNT;
+  if (task_info(mach_task_self(), TASK_VM_INFO, (task_info_t)&vm_info, &vm_count) == KERN_SUCCESS) {
+    js_set(js, result, "rss", js_mknum((double)vm_info.phys_footprint));
+    js_set(js, result, "physFootprint", js_mknum((double)vm_info.phys_footprint));
+  } else if (vtype(js_get(js, result, "rss")) == T_UNDEF) {
+    ant_value_t resident = js_get(js, result, "residentSize");
+    if (vtype(resident) != T_UNDEF) js_set(js, result, "rss", resident);
+  }
 #elif defined(__linux__)
   struct rusage usage;
   if (getrusage(RUSAGE_SELF, &usage) == 0) {