It's not as significant as one might think (the JVM uses it internally for GC and other things). The main problem is the bias it leads to in profiling and that

It's not as significant as one might think (the JVM uses it internally for GC and other things). The main problem is the bias it leads to in profiling and that the time-to-safepoint can sporadically be in the tens of milliseconds with is not great.