

While the performance of reading and saving Adblock Plus filters hasn’t improved yet, we turned off filter hit counts by default in Adblock Plus 2.9.1 as a first consequence to make sure the data no longer needs to be saved that often ( issue 5298). Most importantly, the performance degradation caused by the new data storage turned out more severe than we expected, some users were experiencing regular noticeable browser hangs.

Unfortunately, the Adblock Plus 2.9 release didn’t go as smoothly as we hoped for. Adblock Plus and (a little) more Adblock Plus 2.9.1 for Firefox released
