The new HD versions of MM1 HD are GREAT, but the speed of the game slows down significantly for me when Jack enters a room with alot of activity (lava, birds, etc.).  the game is then slow as molasses after that (the speed of the game, if that's what's displayed in the upper R when using command + D, is about 20 - 27). 

this has happened in all of the mansions that Jack has explored so far (either in full screen view or when it is smaller, about 1/2 size).  suspending the game and resuming does not resolve the problem, only quitting and restarting after suspending the game seems to fix the problem for a while until things slow down again.

in case it helps, the computer is a MacBook Air running OS 10.6.8 with a 1.6 GHz processor (2 GB 667 MHz DDR2 SDRAM). 

Could you give some specific mansions and room numbers where this is happening? (i.e. where the slowdown first starts)

The irony here, btw, is that my 1.2 GHz ppc Mac runs the game just fine -- apparently faster than the new MacBook Airs. That's disappointing.

just a couple of examples -

started Tomb of Princes Normal from the beginning, then got to room 152977 and the speed dropped to 31, in the next room (15298) it was normal again but going back into 152977 it slowed once again.  proceeded along then at normal pace but when Jack entered 15292 the speed dropped again to 37.

started Castle of Doom normal, when Jack entered 16500 the speed went down to 46,  in 16301 it was 49 and then in 16500 the speed varied from 27-39.  in between these rooms the speed was ok.

so, in these quick examples the speed was dropping in select rooms but in previous times as the game goes along everything eventually slows down.

(PS the Air is about 2 yr old so there i would expect/hope that the new Air would be faster....)

I've spent all day yesterday, and am working more today, on speeding the game up. I've seen good results so far, and am hoping that will continue once I finish today's optimizations.

If that turns out to not be enough, I'll have the game automatically remove sprite-based shadows (the ones that move dynamically) when you enter a slow room. This should allow it to again run full-speed, in combination with the optimizations I'm making today.