someone posted this config of theirs in the linux gaming subreddit: https://github.com/mastercoms/tf2cfg
it has some opengl cvars (for mac and linux versions of tf2) that very slightly increased fps for me (as i run linux, don't try using them if you use windows)
additionally this config has some other cvars I have not seen before in this or rhapsody's config, I am curious if comaglia or anyone else knows if these actually affect performance in any way (my own testing makes me think the particle commands DO increase fps a tiny bit, but benchmarking is inconsistent for me)
particle_sim_alt_cores 3 //default 2
cl_particle_batch_mode 2 //default 1
// --- Filesystem ---
filesystem_buffer_size 32768 // keep files up to 32KB away in buffer
filesystem_max_stdio_read 64 // read more files
filesystem_native 1 // use native IO, which is faster
filesystem_unbuffered_io 0 // buffer IO, which decreases disk reads, faster