i have found it realy depends on the bitmap sizes. if you added 70 new. i would replace the same amount if not more with the 1x1 back dots. its alot of work. but its the only thing i have found the would work for me.
i would say a easy way to find out where it stops loading is to change the editors load number to 5 or ten higher each time till it gives you that error. and count whats left after that and it would give you a idea of how many you got to replace starting with 101
edit.. in the config do like 550. then 555 then 560 till the error
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