Why not use incremental garbage collection?

If the VM decides to use all the memory, then it will increase the time between the garbage collections (20 sec instead of 4), but it will also increase the garbage collection time by 4, so every 20 seconds there will be one massive lag spike.ģ. This would need a PC with at least 8 GB RAM (as the real memory usage is almost double the memory visible in Java). Let's give Minecraft 4 GB of RAM to play with. This is a huge amount of work and it needs a very powerful CPU in order to finish in 10 ms. In this minimal time it has to decide which of the several hundred thausand newly generated objects are garbage and can be discarded and which are not. In order not to be noticeable, the garbage collection should run in 10-15 ms maximum. When running with 60 fps, one frame takes about 16 ms. With a default memory limit of 1GB (1000 MB) and working memory of about 200 MB Java has to make a full garbage collection every 4 seconds otherwise it would run out of memory. What happens when the game allocates 200 MB memory every second and discards them immediately?ġ. Currently the game allocates (and throws away immediately) 50 MB/sec when standing still and up to 200 MB/sec when moving. Maybe the biggest and the ugliest problem is the memory allocation.

Minecraft 1.8 has so many performance problems that I just don't know where to start with.

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