Re: SWTOR's years long problem of FPS drops
Is a hard question , post a dxdiag per https://answers.ea.com/t5/General-Discussion-Technical/Guide-Posting-a-DxDiag/m-p/4832663/highlight/true#M70799 to get a better idea of the system setup
on rare occasions network driver / latency can impact on fps as the game waits for data example seen at https://www.swtor.com/community/showthread.php?t=862749
gsynch can be problematic at times see https://www.swtor.com/community/showthread.php?t=970958
few things for nvidia to try turn off AA in game and in the swtor profile in the nvidia control panel set
Antialiasing- FXAA: On
Antialiasing- Mode: Enhance the application setting
Antialiasing- Setting: 8x
MFAA: On
Power Management Mode: Prefer Maximum Performance
Triple Buffering: On
Vertical Sync: Fast (if you use vsync) using just "on" can cause a stutter
also try Low Latency Mode either On or Ultra
edit : another thought is if you have 2 x two Nvidia 2070 Supers in SLI , try turning SLI off and check behavior .. SLI can cause issues in certain games