[SDPhantom]

In short, garbage accumulation and collection is a normal part of running code in Lua. However, forcing a full collection OnUpdate is taxing on any system especially at times when as much CPU power as possible is needed. This is why it's usually best to use preventative measures to ensure not as much garbage is generated too fast. A handful of kilobytes a second is normal, but if you're going through hundreds of them a second, there's a little cause for concern.