GAMEPLAY / CLIENT - creeps disappear and game lags when fighting begins

Since the last patch, I very often get bouts of lag that make it impossible to play. But the lag only occurs once I fighting occurs, whether with creeps or other players. It occurs frequently, but my internet is still the same, and this never occurred before this last patch. When I play jungle and this occurs, the red/blue buff creeps will disappear as soon as fighting begins. The lag is not with my movements within the client, such as mouse or panning. But character movements, and invisible creeps / opponents.

Also, my ping is a stable 100 the entire time. (normal for my connection)