The thread creator has made him/her self appear as a liar in your eyes because instead of asking what experiences other users have had, thread creator made a blanket title statement that concluded slowdown based only on their own experience. You should not be so judgemental of the thread creator. Many have provided plausible reasons that could slow down down any computer such as loading up with a lot of junk files, and getting near max use of storage memory, and filling the phone with potentially hundreds of tracking files by not using content blockers. The fact that I, as well as others have not experience slow downs on our phones is simply stating fact. And doesn't mean the thread creator hasn't. We are simlpy covering plausible possibilities among which perception is one as well.