If you good at ssh procedure, you can enter "top" comment on the terminal to find out which background program uses/utilises most cpu resources. Usually, as mentioned by bro/sis jusbella, torrenting is one of the cause, or a minor bug in the recent released firmware (only if you're using asuswrt). Try to reboot the router and see how it performs. Try to flash into merlin firmware to see if your cpu spikes or remains below 10% in its idle state. In some best cases, factory reset the router to see if the problem persists.

Hmm. Usually the vpn program is culprit here since most of the time (perhaps due to kill-switch or invinsibility on LAN feature). Clear cache on your standard browsers (or use incognito mode) or use a different browser than chrome, i.e. firefox (private window). In some best cases, factory set your router. You can follow the guide provided by ASUS here.

A few users of AC68U faced this problem already as discussed here. It is weird when I don't face such problem before. Even loaded with a few scripts on my ac68u, the cpu still stays idle below than 10%. Have you tried to reset your router mate?

Haha. I guessed it so. Haha. Enjoy mate. Hope you have wonder #WFM ahead. Stay safe.

Haha.

Are you by any chance using stock firmware? Try to flash to merlin firmware and see if it helps.

One small clarification from your side, before you update to the latest firmware, is your router cpu usage graph, high?

Then you may report to ASUSmy regarding this. Since this is more into a firmware issue. If the previous firmware don't really cause a huge spike while the newer one does, then there is bug in the firmware that needed to be addressed by the developer itself, immediately.

This post has been edited by Jjuggler: Mar 20 2020, 07:58 PM

Yes. You can. Proceed with normal method of upgrading the firmware.

First monitor first if the problem were solved. If not, reset the router.

The the unit running on the latest firmware or the previous firmware? Factory reset tends to solve the problem always, it is just, most of us quite hesitate to choose it as an option since 'malas' want to reconfigure everything from scratch. I do understand that feeling.

Im glad. Do update us if any prob persists near in the future.

You got that right bro. Actualy there are a few ways to reduce the time taken to solve a problem if we play our part first in troubleshooting the problem before (most of the time, factory reset does the trick) seeking for the helpdesk.

This post has been edited by Jjuggler: Mar 21 2020, 05:32 PM

We all learning bro. Nothing wrong if sharing the knowledge together. That's the purpose of this and every other forums out there. Sharing knowledge.

I won't advise to do such act especially for novice users. This is because the purpose of factory reset is to change all the values to its factory default settings in the firmware and yes, it is a 'leceh' process of setting up everything once again so most of us skip from saving the settings and reconfigure everything from scratch. By restoring the saved configuration (settings) may cause trouble in the future. If you configure the settings correctly and import it after factory reset, then it shouldn't be a problem at all.

Hi there mate. Thank you for your update. However, I am running asus-merlin with scripts (Diversion + Skynet + Uptime monitoring + speedtest). This is my cpu reading.



I believe it should be a firmware issue (bugs). Don't worry mate, you're not alone as discussed in a dedicated ASUS RT-AC68U Firmware version 3.0.0.4.385.20253 thread, here. Downgrading towards the previous firmware solves the issue. Just use the feedback feature through the asuswrt panel to submit your report.

This post has been edited by Jjuggler: Mar 27 2020, 08:23 PM

If downgrading to the previous firmware gives you good result, then it is a bug issue. You're welcome mate.

I am more interested to get the AX86U.

They will issue a fix soon. No worries.

I am planning to upgrade my current router. The ac68u had served me for nearly two-years and it gives me less headache. Easy to maintain and highly customizable. If the ax86u suits my budget, then I will buy one.

Then your AC68U is my AC68U's senpai. Hahaha.

You're welcome mate.