If you have an NVIDIA or AMD card, adding DXVK (translates DirectX 9 to Vulkan) can dramatically improve FPS .
If you already own a legal copy, you can still apply mods like FusionFix , DXVK , and Radio Downgrader to get a better experience than most RIPs.
: Highly compressed repacks often use custom .exe or .dll files for decompression that antivirus software may incorrectly flag as "False Positives."
Check that you have all parts if the archive is split. Example: