We have found with certain workloads that the initial and maximum tlab sizes result in very high latencies for the first few invocations of particular methods for certain threads. The root cause is that TLABs are too large. This is causing allocatable memory to be depleted too quickly. When large numbers of threads are trying to start up at the same time, some of the threads end up with no TLABs or very small TLABs and their efforts run hundreds of times slower than the threads that were able to grab very large TLABs.