diff --git a/src/components/gpu.c b/src/components/gpu.c
index 7ccca6b..e701d86 100644
--- a/src/components/gpu.c
+++ b/src/components/gpu.c
@@ -359,12 +359,20 @@ void nni_gpu_copy(nni_gpu *gpu, void *_, nn_component *component, nn_computer *c
     
     int changes = 0, clears = 0;
 
+    nn_scrchr_t *tmpBuffer = nn_malloc(sizeof(nn_scrchr_t) * w * h);
+    if(tmpBuffer == NULL) {
+        nn_setCError(computer, "out of memory");
+        return;
+    }
+
     for(int cx = x; cx < x + w; cx++) {
         for(int cy = y; cy < y + h; cy++) {
+            int ox = cx - x;
+            int oy = cy - y;
             nn_scrchr_t src = nn_getPixel(gpu->currentScreen, cx, cy);
             nn_scrchr_t old = nn_getPixel(gpu->currentScreen, cx + tx, cy + ty);
+            tmpBuffer[ox + oy * w] = src;
             if(!nni_samePixel(old, src)) {
-                nn_setPixel(gpu->currentScreen, cx + tx, cy + ty, src);
                 if(src.codepoint == ' ')
                     clears++;
                 else changes++;
@@ -372,6 +380,15 @@ void nni_gpu_copy(nni_gpu *gpu, void *_, nn_component *component, nn_computer *c
         }
     }
 
+    for(int ox = 0; ox < w; ox++) {
+        for(int oy = 0; oy < h; oy++) {
+            nn_scrchr_t p = tmpBuffer[ox + oy * w];
+            nn_setPixel(gpu->currentScreen, ox + x + tx, oy + y + ty, p);
+        }
+    }
+
+    nn_free(tmpBuffer);
+
     nn_addHeat(computer, gpu->ctrl.pixelChangeHeat * changes);
     nn_callCost(computer, gpu->ctrl.pixelChangeCost * changes);
     nn_removeEnergy(computer, gpu->ctrl.pixelChangeEnergy * changes);
diff --git a/src/sandbox.lua b/src/sandbox.lua
index deb8f78..952c34c 100644
--- a/src/sandbox.lua
+++ b/src/sandbox.lua
@@ -394,10 +394,38 @@ sandbox = {
 
     utf8 = copy(utf8),
     unicode = copy(unicode, {
-        wtrunc = function(s, count)
-            return unicode.sub(s, 1, count)
-        end,
+        wtrunc = function (str,space)
+			space = space - 1
+			return str:sub(1,(space >= utf8.len(str)) and (#str) or (utf8.offset(str,space+1)-1))
+		end,
         isWide = function(s) return unicode.wlen(s) > unicode.len(s) end,
+        upper = string.upper,
+        lower = string.lower,
+        sub = function (str,a,b)
+			if not b then b = utf8.len(str) end
+			if not a then a = 1 end
+			-- a = math.max(a,1)
+			
+			if a < 0 then
+				-- negative
+				
+				a = utf8.len(str) + a + 1
+			end
+			
+			if b < 0 then
+				b = utf8.len(str) + b + 1
+			end
+			
+			if a > b then return "" end
+			
+			if b >= utf8.len(str) then b = #str else b = utf8.offset(str,b+1)-1 end
+			
+			if a > utf8.len(str) then return "" end
+			a = utf8.offset(str,a)
+			
+			return str:sub(a,b)
+			-- return str:sub(a, b)
+		end,
     }),
     checkArg = checkArg,
     component = libcomponent,
diff --git a/src/utils.c b/src/utils.c
index b02b9db..0482066 100644
--- a/src/utils.c
+++ b/src/utils.c
@@ -61,6 +61,7 @@ double nn_realTimeClock(void *_) {
 }
 
 void nn_busySleep(double t) {
+    return; // fuck sleep
     double deadline = nn_realTime() + t;
     while(nn_realTime() < deadline) {}
 }