This issue recently happened to me, most apparent on the SoundCloud website, and even on some other websites (such as YouTube and this Opera forum), but with less freezing.
I have a CyberPC with Windows 10, AMD FX QuadCore, 8GB RAM, and the latest version of Opera: 46.0.2597.32 (PGO).
Recently, SoundCloud (I will use SC for short) has start freezing up for me everytime I load it. To show everyone better, here is a video I recorded of the problem I have: https://youtu.be/oNhAhGhr1FE
Problem: Basically, when I enter the site it would be fine, if there are no songs/results to load. The moment I search up something or go to my Feed, it would freeze up and the mouse will have a flashing loading blue wheel. It will remains so for ~30 seconds, then back to normal. If I scroll down to see more results (which the site will have to load), then it will freeze again.
Observation: In that video I have my Task Manager open, and beside the Expression Encoder 4 process that I used to record, it was the System process that I paid attention to. Whenever the site is normal, System would take <5% CPU, with overall CPU at <30%. However, when the site freezes up, System would go up to ~15% CPU, while overall CPU would be ~70%.
Interaction: When frozen, usually I cannot interact with the page with any means. Mouse will have a flashing blue loading wheel. Closing the tab or the window will takes a few seconds to execute. Typing in the address bar or resizing the browser is still possible (however the content will take a while to be resized). Sometimes I can use the mouse wheel to scroll through the results, but still without being able to click on any of the content. When not frozen, site operates like normal.
My question would be what are the possible solutions to this problem? So far using Opera, I think this is the only site that lags and freezes in all the sites I used daily. Anything will help~
Thank you for any assistance.