Slow cache_set queries

I'm currently building a Drupal website, but it has been very slow for almost as long as I can remember. I tried numerous solutions such as increasing packet size and other settings, but they didn't work. I also tried running it on someone else's pc (via wamp) and on a server online, but both are equally slow.

I've also seen a few posts about slow cache_get queries and tried a few solutions (such as using compression), but they didn't work either. Although sometimes these queries are slow for me too, it seems to be mostly the cache_set queries that are taking up a lot of time. I included a screenshot of the Devel log here and would really appreciate any help!