High wait time means application suffers with parallel performance, use Thread Summary to analyze per thread total run time, wait time and wait time percentage of the thread from total time of the thread. If a thread is optimized, then it’s wait time and percentage wait time might reduce when compare before and after optimization. It helps to identify whether a thread is using the core effectively or not.
Use Wait Object Summary to identify performance critical synchronization object which has more amount of wait time and wait count.
Syscall Summary provides the system call count, total time spent by the application on a system call. It helps to identify the system calls consuming most of the time and that can be optimized if the system calls are blocking or waiting in nature.