Set the lowest possible quality, switch off all effects - both graphical in games settings as well as player's one in character's settings, try different modes (full screen, windowed, borderless) to see which one performs best for you, try to get updated drivers for your graphic card, kill ALL unnecessary apps and processes on PC while playing the game (in task manager) like indexing etc., if possible, try to add memory ... plenty other small tweeks here and there which can bit by bit improve the playability of the game.