Sorry for your issues. Can you tell me where in the world you're posting from? We did a major overhaul of our backend server infrastructure in October/November of last year, moving to Amazon Web Services, and away from a dedicated server setup. But if your issues are more recent, that change probably wouldn't be related.
You've mentioned to us your browser, but can you give us info on the device(s) you're using and maybe something about your Internet connection? You've mentioned mobile. What's your speed? WIFI or cellular? Is your home or work connection cellular, cable, FIOS, etc.? Do you run anything other than a standard antivirus package on your computer? What about browser add-ons related to security or privacy or filtering? I would try to run the browser in a default setup and start enabling any of those one by one to see if anything changes. All of that will help to diagnose your problem.
As for your feedback about the website being unresponsive, is this on the first load, or subsequent loads, during any specific tasks, like just reading and moving to the next page, or posting/replying, or logging in? Just in the Forums, or elsewhere. Or literally all the time? Do you visit the site around the same time each day? What time is that (and your timezone)?
We have staff in different places around the world, on the site at all hours of the day. While we do experience some issues when posting (this is more related to our Forums platform), we haven't received support requests similar to yours.
lexys also mentioned virus alerts. We haven't experienced those ourselves, nor have we received any support inquires related to such alerts recently. But your antivirus software could be configured for active scanning, and based on your hardware (and many other things) could definitely affect your computer 9and browser) performance. Mobile devices are another story.
Now, if you opened up another browser tab to another website while simultaneously visiting ours, and one worked and ours didn't, we could easily eliminate some potentially bad actors, and focus just on our website. So when you have the time, and if the issue persists, provide us as much detail as you can.