GPU: Adjust draw timing approximation

Cache seems to be able to go up to 128x8? Constructor draws sprites that
fit exactly in the texture cache, and does so within vblank, so it can't
take too long to draw.

src/core/gpu.h

@@ -358,9 +358,11 @@ private:
         case GPUTextureMode::Palette8Bit:
         {
           // Texture cache reload every 2 pixels, reads in 8 bytes (assuming 4x2). Cache only reloads if the
-          // draw width is greater than 32, otherwise the cache hits between rows.
-          if (drawn_width >= 32)
+          // draw width is greater than 128, otherwise the cache hits between rows.
+          if (drawn_width > 128)
             ticks_per_row += (drawn_width / 4) * 8;
+          else if ((drawn_width * drawn_height) > 2048)
+            ticks_per_row += ((drawn_width / 4) * (4 * (128 / drawn_width)));
           else
             ticks_per_row += drawn_width;
         }
@@ -370,8 +372,10 @@ private:
         case GPUTextureMode::Reserved_Direct16Bit:
         {
           // Same as above, except with 2x2 blocks instead of 4x2.
-          if (drawn_width >= 32)
+          if (drawn_width > 128)
             ticks_per_row += (drawn_width / 2) * 8;
+          else if ((drawn_width * drawn_height) > 1024)
+            ticks_per_row += ((drawn_width / 4) * (8 * (128 / drawn_width)));
           else
             ticks_per_row += drawn_width;
         }