Do comments affect performance?

Question

Am I correct to say that JavaScript code isn\'t compiled, not even JIT? If so, does that mean that comments have an affect on performance, and I should be very careful where I p

Answer 1

In some perhaps isolated circumstances, comments definitely somehow bog down the code execution. I am writing a lengthy userscript, using in the latest Firefox on Mac using TamperMonkey, and several days' increasingly frustrated troubleshooting came to an end when I stripped the lengthy comments from the script and suddenly the script execution stopped hanging completely on Facebook. Multiple back-and-forth comparisons running the same exact script on a fresh user account, the only difference being the comments, proved this to be the case.