Hi there.
This discussion remind me of some tests I did sone time ago. You probably already knew it but just in case (cycle pairing + YM):
lea $ffff8800,a0
lea $ffff8801,a1
lea $ffff8804,a3
moveq #0,d0
;; ; Real | Hatari (2.3.1)
;; -------------;--------|---------------
lsr #2,d0 ; |
move.b (a0),d2 ; 2 nops | 3 nops
;; -------------;--------|---------------
lsr #2,d0 ; |
move.b d0,(a0) ; 2 nops | 3 nops
;; -------------;--------|---------------
lsr #2,d0 ; |
move.l (a0),d0 ; 3 nops | 4 nops
;; -------------;--------|---------------
lsr #2,d0 ; |
move.l d0,(a0) ; 3 nops | 4 nops
;; -------------;--------|---------------
lsr dx,d0 ; | Hard to reproduce !
move.w -(a3),d0 ; 3 nops | 3..4 nops
;; -------------;--------|---------------
lsr dx,d0 ; | Hard to reproduce !
move.l -(a3),d0 ; 4 nops | 4..5 nops
;; -------------;--------|---------------