The JavaScript execution time may be unstable at times. Avoid instability by understanding its sources, just-in-time compiler operation, and garbage collector usage.
While smaller scripts typically do not result in instability, observed irregularities in script execution times result from two primary sources:
Just-in-time compiler operation. When developing a script, subsequent iterations after the initial script are accelerated.
The JavaScript memory model uses a garbage collector. Scripts that use a lot of memory must use the garbage collector to clean up unused memory during execution periodically, which reduces the time it takes to execute.
