Here is my "main system" I can go to around 90FPS in Firestorm, bit higher in other viewers. I have gotten SL Viewers to run on my Steam Deck at around 60FPS. TBH though I frame limit because of the refresh rate of the monitors my system is attached to. I have a secondary system my GF is using that is running a AMD RX580 8GB card same amount of RAM and a bit of an older Intel CPU and Windows 10 with about 60-70 FPS. It all depends on your whole setup what resolution and refresh rate your monitors run at. Also, what you find acceptable for your graphics settings vs. your budget.
CPU: AMD Ryzen 5 3600 6-Core Processor (2200 MHz)
Memory: 32048 MB
Concurrency: 12
OS Version: Linux 5.15.0-73-generic #80-Ubuntu SMP Mon May 15 15:18:26 UTC 2023 x86_64
Graphics Card Vendor: NVIDIA Corporation
Graphics Card: NVIDIA GeForce RTX 3060 Ti/PCIe/SSE2
Graphics Card Memory: 8192 MB
OpenGL Version: 4.6.0 NVIDIA 530.41.03