Currently running v1.2.0.0-adgr and when it hit around 3000 mini transactions it made the wallet really slow, so i was forced to tidy it up and that was a real pain as it took many hours... Im running the wallet on a i7 4930k @ 4,7Ghz and 32Gb of ram so i dont think my pc is the limitation to the transactions, but i must admit i dont remember trying the repairwallet and then doing more then 67 transactions as i already spent the time on tidy it and now i keep it clean every 3-4 days, but ill try and let it accumulate more then 67 mini transactions and try the repairwallet function and get back with the result in a few days time