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Performance in PCSX2? Surprisingly, that wasn’t the main issue. PCSX2 decompresses the ISO on the fly (especially with CHD or zipped formats), so load times can be slightly longer, but gameplay framerates remained stable on my mid-range PC. The bigger issue is – some compressed versions use modified headers or custom ripping methods that cause PCSX2 to crash at specific points, especially during FMV-heavy sequences.
An older method where the emulator creates an "index file" the first time you load the game to speed up later access. 2. Why Some Games Compress Better ("The Science") pcsx2 games highly compressed
When gamers look for they are usually looking for files that have been shrunk significantly—often down to 100MB, 200MB, or 500MB—using advanced compression algorithms. Performance in PCSX2
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