>Can anybody spot any cheap ways to gain some cycles?
Chris' advice to split up the table into 6 parts is a good one and will give you a good result immediately.
Also, why are you switching to ldx Maze,y for the second half of the screen? If you stuck with lda Maze,y throughout, you can use X as your loop counter without having to store it to RAM. This will save you 6 cycles in the MazeRowLoop and 3 cycles in MazeRow:
[My notes is ()]
MazeRow
ldx #$0C ; cycles 2
; stx tmp2 ; cycles 3 == 5 (eliminate use of tmp2)
lda #$00 ;(Use A so as not to overwrite X)
sta GRP0
; draw player
lda myrow
eor man
bne label1
lda #$FF ;(Use A so as not to overwrite X)
sta GRP0
label1
MazeRowLoop
ldy myrow ; cycles 3
sta WSYNC ; cycles 3 (Changed for personal preference)
lda Maze1,Y ; cycles 4
sta PF0 ; cycles 3
; iny ; cycles 2 (Eliminate this)
lda Maze2,Y ; cycles 4
sta PF1 ; cycles 3
; iny ; cycles 2 (Eliminate this)
lda Maze3,Y ; cycles 4
sta PF2 ; cycles 3 == 25
;(You will probably need some NOPs in here)
; iny ; cycles 2 (Eliminate this)
lda Maze4,Y ; cycles 4 (Use A instead of X)
sta PF0 ; cycles 3
; iny ; cycles 2 (Eliminate this)
lda Maze5,Y ; cycles 4
sta PF1 ; cycles 3
; iny ; cycles 2 (Eliminate this)
lda Maze6,Y ; cycles 4
sta PF2 ; cycles 3 == 27
iny ; (INY consolidated into one instance)
; ldx tmp2 ; (Elminate this)
dex
; stx tmp2 ; (Elminate this)
bne MazeRowLoop
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