[KWo]

What do You mean the bots are laggy? Is the server lags on real players (the people have high ping and are being lagged after using V3B19d) or only just bots are movingin slow motion? Hint - don't use booster programs on Your server while using bots.
They don't cheat - they don't use wallhacks nor aimbots. They almost never can hit You behind the wall if You are moving. They are trying to fire "somewhere" near You when You are behind the wall, but never at exact position. The one exception when they may hit You is when they are trying to shoot at Your last seen position by them. So You just need to move a bit. They aim a bit better than in V3B18g, but it was just improved targeting moving enemies.