Sorry if i'm teaching Granny to suck eggs here but, the following are normally good idea's to check first.
- Are you running any major downloads at the same time?
- Do you have stuff like Steam, GoG Galaxy etc etc running?
- Running over wireless?
- What's the ping latency like in comparison to other sites (BBC.co.uk) is a good test bench
- Good to check what your upload speed on the router is as well, and see if you're hitting the max.
Sorry about the generic questions, but well, I'm not really sure the bed you've got there
