disillusions

Hey everyone! I recently switched from Firestorm to Alchemy viewer because I've been having issues with my FPS. In sims with not much detail, I get about 70-80 AVERAGE FPS. In sims such as clothing stores, I run at 14-20. I am unsure as to why, and I am unfamiliar with graphics settings in Second Life overall, especially now that I am still unfamiliar with the new viewer I am using. Are there any specific settings to get me to the most optimal and smooth gameplay while also still looking good? I have an AMD Radeon RX 6500 XT GPU, AMD Ryzen 5 5600G, 16GB of RAM, and a 12 core processor. Thanks!