diff --git a/src/components/filesystem.c b/src/components/filesystem.c
index b41ac5c..cfc107f 100644
--- a/src/components/filesystem.c
+++ b/src/components/filesystem.c
@@ -127,6 +127,8 @@ void nn_fs_size(nn_filesystem *fs, void *_, nn_component *component, nn_computer
     }
 
     size_t byteSize = fs->size(component, fs->userdata, path);
+
+    nn_return(computer, nn_values_integer(byteSize));
     
     nn_fs_readCost(fs, 1, component, computer);
 }
@@ -162,7 +164,14 @@ void nn_fs_lastModified(nn_filesystem *fs, void *_, nn_component *component, nn_
         return;
     }
 
-    nn_return(computer, nn_values_integer(fs->lastModified(component, fs->userdata, path)));
+    size_t t = fs->lastModified(component, fs->userdata, path);
+
+    // OpenOS does BULLSHIT with this thing, dividing it by 1000 and expecting it to be
+    // fucking usable as a date, meaning it needs to be an int.
+    // Because of that, we ensure it is divisible by 1000
+    t -= t % 1000;
+
+    nn_return(computer, nn_values_integer(t));
    
     nn_fs_readCost(fs, 1, component, computer);
 }
diff --git a/src/emulator.c b/src/emulator.c
index 1265591..6cd2105 100644
--- a/src/emulator.c
+++ b/src/emulator.c
@@ -680,7 +680,11 @@ render:
         Color heatColor = GREEN;
         if(heat > 60) heatColor = YELLOW;
         if(heat > 80) heatColor = RED;
-        DrawText(TextFormat("Heat: %lf\n", heat), 10, GetScreenHeight() - 30, 20, heatColor);
+
+        size_t memUsage = nn_getComputerMemoryUsed(computer);
+        size_t memTotal = nn_getComputerMemoryTotal(computer);
+
+        DrawText(TextFormat("Heat: %.02lf Memory Used: %.2lf%%", heat, (double)memUsage / memTotal * 100), 10, GetScreenHeight() - 30, 20, heatColor);
 
         EndDrawing();
     }
diff --git a/src/sandbox.lua b/src/sandbox.lua
index 952c34c..7733e83 100644
--- a/src/sandbox.lua
+++ b/src/sandbox.lua
@@ -8,9 +8,7 @@ local function copy(v, p)
         end
         if p then
             for key, val in pairs(p) do
-                if not rawget(t, key) then
-                    t[key] = copy(val)
-                end
+                t[key] = copy(val)
             end
         end
         return t
@@ -434,6 +432,8 @@ sandbox = {
 }
 sandbox._G = sandbox
 
+print("oh gosh", sandbox.unicode.sub("abc", 1, 0))
+
 local function bootstrap()
     local eeprom = libcomponent.list("eeprom")()
     assert(eeprom, "no eeprom")
diff --git a/src/testLuaArch.c b/src/testLuaArch.c
index 125a8b4..8b7df6c 100644
--- a/src/testLuaArch.c
+++ b/src/testLuaArch.c
@@ -444,6 +444,10 @@ int testLuaArch_unicode_sub(lua_State *L) {
         return 1;
     }
     // Lua indexing bullshit
+    if(stop == 0) {
+        lua_pushstring(L, "");
+        return 1;
+    }
     if(start > 0) {
         start -= 1;
     } else if(start < 0) {