We discovered a serious problem with the emoji-script while loading content with ajax. On IE11 inserting the loaded content (about 40 <divs> with some child-nodes) took ~20 seconds. Using the profiler (via the f12 developer tools) we discovered that the emojii script was taking ~19 seconds to execute while inserting the nodes.
We removed the script with the code mentioned above and the content now inserts in about 0.3 seconds.
We will try to see why this is happening.
Stephan