I have an issues with a couple Mod packs i have installed on my cursevoice client. I get good FPS 40-60 when I'm walking around, no sign of lag. The issues comes into play when I break any blocks, there is a delay 3-6 sec for the block to actually break. I think it may be one of the mods, just wondering if anyone else has had a similar issue. One packs is from FTB and I do not see any forum posts on their official forum page relating to the issue. The other pack is a Curse Mod pack so I'm not sure if it is from using CurseVoice or just a particular mod in the pack.