With higher end hardware, this generally runs at native resolution between 50-60fps for me. Occasional drops into the high 40's when driving in the city, but it's pretty playable.
Nevertheless I would probably just stick with Vanity Pack on PC if you don't have a 6- or 8-core processor.
Specs:
RPCS3 v0.0.13-11216-52fa69d9 Alpha | HEAD | Firmware version: 4.86
Intel® Core i7-9700K CPU @ 3.60GHz | 8 Threads | 47.94 GiB RAM | TSC: 3.600GHz | AVX+ | FMA3
Operating system: Windows, Major: 10, Minor: 0, Build: 19042, Service Pack: none, Compatibility mode: 0
RSX: Found vulkan-compatible GPU: 'GeForce RTX 2060 SUPER' running on driver 457.30.0.0