It's not necessarily too slow, but it's one explanation for low latency vsync problems. One way to test that is to use "less accurate" in FS-UAE launcher, and make sure you use A500/A500+/A600, and not A1200! That should give a good bit of extra performance. If scrolling is perfectly smooth then...
(FS-UAE is also slightly optimized towards discrete GPUs. With integrated GPUs, the texture transfer is probably pointless, and FS-UAE could rather use some kind of unified memory support instead).
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