Graphics rendering and bad performance issues since 2.0.4.x

[nekrondev]

After upgrading browser to Gecko 38 rendering engine browsing experience has gone real worse. Many websites keep on loading forever (www.zeit.de) or crashing the browser / making it unresponsive after a few roundtrips. Often there is a strange flickering on a website (no that good if you suffer from spasticity) before the browser crashes. This behaviour can be found on Jolla 1, Jolla C and Jolla tablet and it still present on latest 2.0.5 update.

See here for TJC topics:
https://together.jolla.com/question/149068/graphics-rendering-browser/
https://together.jolla.com/question/152954/jolla-browser-flickering-and-hangs-in-this-website/

[ghost]

Here's a link to the most popular TJC topic regarding this issue: https://together.jolla.com/question/149683/bug-browser-freezing-andor-blinking-after-updating-to-fiskarsinjoki/?comment=154640#comment-154640

I took a video showing browser-flickering on Jolla 1 (displayed page is http://repo.merproject.org/): https://dl.dropboxusercontent.com/u/77714021/Jolla_browser_blinking.mp4
Even though flickering of websites & crashes have happened many times (on Jolla C & Jolla 1, both 2.0.5) I couldn't figure out any pattern - it happens randomly on complex but also simple websites.