Kanjipad is sluggish with Kanjipad Ext

[mvysny]

The problem is most probably related to #662 and #665 - I am sorting kanjis by stroke numbers on the UI thread which is bad practice and most probably causes the drawing lag. Why only the paid add-on is affected? This is simply because the internal kanjipad provides less kanjis, therefore they are sorted faster and the lag is not as apparent.

[mvysny]

I have moved most CPU heavy work to a background thread. However, you will only benefit from this if you have phone with at least dual-core CPU.
Going to perform several more optimizations.

[mvysny]

Finally switched to RecyclerView and properly reusing views. The UI should now be a lot more responsive. Closing as fixed in Aedict 3.39.18.