I have an unused twitch account that I used to watch league of legends on in the mid 2010s. I logged in the other day for the first time in years, and the top stream was titled "NAKED JUMPING JACKS IN SHOWER" and had a nude girl taking a shower. A ton of the other recommendations were the same.
People don't have to search these streams out, whatever recommendation algorithms they use are recommending them to people who have only used twitch to stream games.
Imo twitch is a website for game streaming, there are plenty of other sites for sexual content.
Hours played on the deck specifically.
Also with the witcher 3, my understanding is one of the heavy performance killers is apparently grass quality. Cryobyte33 has a video on getting it to run well. You can also downgrade to the non-"next gen" version of the game, which still looks pretty good and runs way better. I believe it's listed as one of the beta options in properties.