Banners with multiple pattern layers can affect rendering performance

The bug

When banners with multiple patterns are rendered, the frame rate impact is higher than banners with no layers at all. This can be seen when placing a certain number of banners with a single color (in the creative menu) against a number of banners with +6 layers (more layers = worse frame rate).

White banner (no layers):

Blue banner (8 layers):

Blue banner (16 layers):

This issue may be minor as players aren't able to craft banners with more than 6 layers, but there are certain banners that can only be obtained with commands, which might be an issue in buildings with a large number of banners placed around, such as a city, castle or something along the lines. Results may depend on hardware and the number of banners + number of patterns placed.

How to reproduce

1. Create a void world.

2. Fill a certain area with any banner with no patterns and check your FPS graph (ALT+F3), replace with the coords you want.

   /fill x1 y1 z1 x2 y2 z2 minecraft:blue_banner

3. Now fill the same area with this banner (16 layers), use the same coords as before:

   /fill x1 y1 z1 x2 y2 z2 minecraft:blue_banner{Patterns:[{Pattern:ss,Color:15},{Pattern:cbo,Color:11},{Pattern:tts,Color:15},{Pattern:bts,Color:15},{Pattern:mr,Color:11},{Pattern:bo,Color:15},{Pattern:flo,Color:15},{Pattern:mc,Color:3},{Pattern:ss,Color:15},{Pattern:cbo,Color:11},{Pattern:tts,Color:15},{Pattern:bts,Color:15},{Pattern:mr,Color:11},{Pattern:bo,Color:15},{Pattern:flo,Color:15},{Pattern:mc,Color:3}]}

4. Compare the frame rate.