Here I test SMT On and Off for Poe standing in my hideout without moving. It is clear that average FPS is a bit lower with SMT Off. Some users report a increase in minimum frames during heavy loads with SMT Off.
Distro: Steam Runtime 2 (soldier)
CPU: AMD Ryzen 7 1700 Eight-Core Processor
RAM: 16 GB
Ran 7 Ashen woods and logged fps specifically during the harby fights. Uploading for myself but good benchmark to how smooth PoE is on Proton experimental as of 2nd of April.
Running Pop!_os 20.10 with Ryzen 7 1700 (most likely the bottleneck of my system) a Sapphire Pulse 5600XT (OCed to stock limits, card has no problem sitting at these speeds as the OC is notoriously small)