Garbage Collection and Skipped Turns

I've had to deal with this quite a bit when writing games in c#. Similar to Java the GC can case obvious stalls. The easiest way is to stop calling the "new" function at run time by using pooling. For instance at the start of a match, or a round create a container object which contains N pooled objects which you know you create often, eg wave objects. At the point you wish to use one, take it from the pool, initialise it, use it, then return it to the pool when finished at any point later on. 

Because you have not called new, and then nulled the object, the memory used does not go up, it stays constant, thus no GC is run. It's obviously impractical to pool everything so you just do the worst offenders which are things that you create often and throw away.