Setinterval CPU intensive- Is setInterval CPU intensive?

problem ：

I read somewhere that setInterval is CPU intensive. I read somewhere setInterval yes CPU intensive .I created a script that uses setInterval and monitored the CPU usage but didn't notice a change. I created a usage setInterval Script and monitor CPU Usage but didn't notice the change .I want to know if there is something I missed. I want to know if there is anything missing .

What the code does is check for changes to the hash in the URL (content after #) every 100 milliseconds and if it has changed, load a page using AJAX. What the code does is every 100 One millisecond check URL Hash value in （＃ What follows ） The change of , If it has changed , Then use AJAX Loading page .If it has not changed, nothing happens. If it doesn't change , No reaction .Would there be any CPU issues with that. Will there be any CPU problem .

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Solution ：

Reference resources ： https://stackoom.com/en/question/Ru0E