Well, xBRZ tries to "filter" FMVs as well, and since they're low res, with heavy blocking created by resolution upscaling, it will get very slow because of the real time/constant filtering process, depending on how "detailed" the scene is. One of the slowest intro FMVs for me, is the ones in Capcom games after Resident Evil 2, it was slow even without xBRZ. It will crash if xBRZ is too high (above x4 for me). But not only FMVs, during framebuffer effects as well, there's a random error message sometimes related to C++, other times a proper Pcsx error or something.
I like the look that xBR(Z) gives to games, but the many issues it has with the Tweak right now, make it almost unusable (after playing many games, only a few are really playable with xBRZ). I hope @
tapeq comes back to the Tweaks sometime, his work on it was great. But that discussion would be better on the Tweaks thread, so @
Thirteen1355, if you have any other doubts related to xBRZ, I would recommend asking there, since there's a better chance of tapeq looking at it (I guess).
Or maybe a small feature request to "turn off" xBRz during MDECs (or something), like "FasFBE" did for framebuffer effects, would be nice... Too hard maybe

? (Give a 'Yay' for "FastFMV"!!)