JavaScript benchmarking has realized substantial complexities due to the variability introduced by JIT (Just-In-Time) compilation. The JVM community has shared insights stating it's essential to run benchmarks in varied environments and to allow sufficient time for JIT to optimize the code. Comments highlight the misbelief that repeated runs can average out performance inconsistencies, noting that this may not accurately reflect actual JIT performance. Security measures, especially in response to speculative execution attacks like Spectre, have also influenced timer accuracy in JavaScript engines. Consequently, this creates a challenge for developers who need to benchmark code intended to run across diverse JavaScript environments.