Oh! It is no only me who is facing this problem, I thought that the problem is only in my case, I thought that my ISP is cheating me, I complained to them.
Although I am not facing the problem now, yesterday and the day before yesterday I faced a lot of loading, which became a disturbing to my work a lot. I think if you are still facing this problem then there is may an issue in your ISP network. Other wise I am now browsing the forum smoothly.
I was surprised to see this thread myself and you should know that this happened today, and not yesterday or 2 days ago as you claimed. Maybe your issue was different because it is not about the mere slowness in browsing as seen in the OP but also an error as seen in the image attached.
I never witnessed this myself, maybe I was lucky because I started posting an hour after the thread was created. What surprised me more is that I started posting during the time of many replies to the thread but never experienced the issue till now. I only experienced the security check that we complained about a while ago.
I think it was just twice, that was all and it loaded very fast even after the human verification.