diff --git a/src/components/gpu.c b/src/components/gpu.c
index 946be58..7ccca6b 100644
--- a/src/components/gpu.c
+++ b/src/components/gpu.c
@@ -140,12 +140,9 @@ void nni_gpu_set(nni_gpu *gpu, void *_, nn_component *component, nn_computer *co
         return;
     }
 
-    printf("It is to print: %s\n", s);
-
     int current = 0;
     while(s[current] != 0) {
         int codepoint = nn_unicode_codepointAt(s, current);
-        printf("char rendered: %i\n", codepoint);
         nn_setPixel(gpu->currentScreen, x, y, nni_gpu_makePixel(gpu, s + current));
         if(isVertical) {
             y++;
diff --git a/src/emulator.c b/src/emulator.c
index 2e34dd8..b8417d8 100644
--- a/src/emulator.c
+++ b/src/emulator.c
@@ -502,7 +502,7 @@ int main() {
         .read = (void *)ne_fs_read,
         .seek = NULL,
     };
-    nn_addFileSystem(computer, "OpenOS", 1, &genericFS);
+    nn_addFileSystem(computer, "frostos", 1, &genericFS);
 
     nn_screen *s = nn_newScreen(80, 32, 16, 16, 256);
     nn_addKeyboard(s, "shitty keyboard");
diff --git a/src/neonucleus.h b/src/neonucleus.h
index 851b513..85c489f 100644
--- a/src/neonucleus.h
+++ b/src/neonucleus.h
@@ -65,7 +65,7 @@
 #define NN_CALL_HEAT 0.05
 #define NN_CALL_COST 1
 #define NN_LABEL_SIZE 128
-#define NN_INDIRECT_CALL_LATENCY 0.005
+#define NN_INDIRECT_CALL_LATENCY 0.0005
 
 typedef struct nn_guard nn_guard;
 typedef atomic_size_t nn_refc;
diff --git a/src/testLuaArch.c b/src/testLuaArch.c
index 642e476..3674fe1 100644
--- a/src/testLuaArch.c
+++ b/src/testLuaArch.c
@@ -458,6 +458,18 @@ int testLuaArch_unicode_sub(lua_State *L) {
     if(stop < 0) stop = 0;
     if(start >= len) start = len - 1;
     if(stop >= len) stop = len - 1;
+    if(stop < start) {
+        lua_pushstring(L, "");
+        return 1;
+    }
+    if(start < 0) {
+        lua_pushstring(L, "");
+        return 1;
+    }
+    if((stop - start) >= len) {
+        lua_pushstring(L, "");
+        return 1;
+    }
     // there is a way to do it without an allocation
     // however, I'm lazy
     unsigned int *points = nn_unicode_codepoints(s);