Hello Catalin,
when I upgraded to the latest version of CID I took following steps: Help > About Icedragon and applied the update from there.
I do have Windows Home 10, Version 1803 - 17134.376.
Windows update and all other programs are up-to-date.
It happened on most site, specially Facebook, the dashboard of my web store & marktplaats.nl. These sites I use a lot during the day.
I have tried several things to speed things up (Ran CCleaner, de-fragmented my hard-drive, deactivated the Adblockers) till I realized this problem occurred since I had updated CID.
After I posted my comment in the forum, I decided to download the 64-version of CID and re-install the browser, using the file. I started the program and used the repair option and that seems to have done the trick.
Facebook is still slow at times, but not as bad as it was yesterday.
The other sites look to have their normal speed again, but I will be able to judge better after I used them more later today.
Thanks so far.
Nel