Slow runtimes

Good morning, starting last week, I've been noticing that the percentage runtimes in my submissions have gotten way slower than they used to be. By this I don't mean that I can't come up with optimal solutions, for example on trivial problems like reversing a linked list, the solution that used to give me top 99.38% is now only giving me top 48.47%.
I have submitted my solution many times and I noticed that the overall performance is slower, is this a problem on my end (Internet connection, web browser, etc)? Or has anybody else noticed this?
P.S: I am using python 3 as the language I use for Leetcode and interviews

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