rumor has it there have been some Denial of Service attacks by some disgruntled script kiddies, but it's small scale only creates a annoyance..
And at 3am CST, thee backup up takes place and slows the site down.
Assuming it is not those, you should reboot your PC, turn your modem/router off and then back on.
there are also two utilities that are free that can help speed up your performance if it is your PC is the problem
http://www.tweaking.com/content/page...ll_in_one.html
and Ccleaner:
https://www.piriform.com/ccleaner
You might have trojans.
get avast from avast.com (free version)
and malwarebytes free version from malwarebytes.org.
Hope that helps.