In 3.3, ACLS accepts 3 arguments, which disable some things when not 0
ACLSskipGraphics,skipSpdef,skipFontskipGraphics will skip clearing the graphics pages and loading the default sprite/BG sheets (the slowest part).
skipDef will skip resetting the sprite definitions (minimal speed impact).
skipFont will skip loading the default font (minimal speed impact).
If you are not using the default sprites/BG, you can do:FOR I=0 TO 3
ACLS TRUE,FALSE,FALSEThis is the same as normal ACLS, but doesn't load the default sprite/BG sheets. (Which is fine if you load your own right after or aren't using sprites/BG)