Also, I'm experiencing some Gateway time-out Error code 504 right now, trying to reload the website, and it's still not going through. Are there any issues right now?
It seems fine right now. I have just tried playing around with the service on multiple browsers. Both Chrome, Firefox, and Mullvad browser work just fine.
The service tends to get a bit slower depending on how much data it needs to display. When I fed it addresses that didn't have too much on-chain activity, it's fast. I then tried with a random address that had thousands of transactions and that's when it needs more time. All of that is normal, though.
Yes, I also made attempt to access it with the help of Chrome, and all was fine. This probably is as result of your problem with your internet connection. Cloudflare sometimes block some internet connections that it considers to be unsafe. Hopefully, you will soon have a resolved issue.

It's already working fine now, I just access it, and I think it was really fast already. I try searching my address again and it was very fast this time, i think they make another update, even the features seems to work very smooth this time, even though there are times that it takes some time but it was really smooth.
The Gateway Error was some error on the website, it was just a slight problem, but it was usually the website issue, probably they are doing maintenance or update on the backend, or maybe some issue on the server but it can easily be fix, I have a good connection so im pretty sure that they are doing something.