Slow browser at reference desk PC

I submitted a help desk request today (#4413) to note the problematic browser on the PC at the front the reference desk (the PC by closest to the library entrance). As you may have noticed over the past month, pages often load extremely slowly for no good reason, and when you try to open additional browser windows, they take forever open and load. Clearing the cache in the browser (Tools>Internet Options>Delete Files...) seems to have no effect on the problem.