I had a Samsung Galaxy S2 and a Nexus 10 which both suffered from flash related problems making them incredibly slow. Samsung never fixed that nor was there eve

I had a Samsung Galaxy S2 and a Nexus 10 which both suffered from flash related problems making them incredibly slow. Samsung never fixed that nor was there ever a recall. I also owned a HTC One M7 which worked well for a very long time but it also got slow even though there were no hardware problems. The M7 worked just as good from day one if I factory reset it, it only becomes slow again once all the apps are updated. What I think is happening here is that apps move to the newer Android API but keep compatibility with older Android versions through compatibility layers, and they compound so once the entire compatibility layer stack becomes "too thick" the CPU gets bogged down and the whole thing becomes slow...