Beginning with the Alpha 27 series (code name Agni) we had a first Alpha 27 Agni - Patch Release 1 (a27.1.) There are signs we'll see a Release 28 Boiorix - Patch Release 1 (v0.28.1) in a few weeks.
It's not the standard type of latency lag there. Only some sluggishness during a long match with many, many units.
It's gotten much better since A27.1.