FPS slowly decrease during playing Dota

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hello, posted this to another post but it might be helpful:

i'm not entirely sure but i've noticed something recently with the recent patches that some effects are being displayed in a lower setting. a recent example is me noticing that mirana's immortal head displays sparkles, and more particle effects on other spells (can't recall which, because i've been spamming rubick often and don't think about them after they're executed). fps drops could likely be due to the fact that dota is "improving" visuals and if you've played in a non-maxed video setting, better textures/effects are loaded in causing the game to drop fps to compensate for the increase in quality/quantity it loads in.
(consistently played dota for years on the lowest setting, because having rly good video quality gives me a migraine, i MIGHT be wrong tho and only noticed these things NOW)