Slow But Sustained CPU Drain

[rdsubhas]

Hi, firstly thanks so much for this wonderful extension.

I'm observing a slow but consistent CPU drain (0.3% CPU usage), irrespective of any tab is active or not. I'm not sure if this is normal, but 0.3% over a long period of time (I tend to leave Chrome running) seems to consume a lot of energy. Interestingly, uMatrix doesn't have this problem.

So is this an issue, or is there any way the extension can go to complete sleep (0% cpu) when there is nothing active?

With no tabs active:

With tabs settled:

More details:
Chrome 48.0.2564.109 (64-bit), OSX 10.11.2, uBlock Origin 1.5.6

[gorhill]

Here is a 2-minute video of uBO's CPU usage while the browser is left idle:
https://a.pomf.cat/kblydv.webm

Following this, I opened uBO's dev console, and clicked "Pause script execution" in the Sources pane: the execution was not paused when the browser was left on idle, despite the CPU value sometimes showing "1". This means that whatever is causing CPU to show non-zero value while on idle, it's not uBO's code executing, it's the browser's code.

There is no actual uBO's code being constantly and pointlessly being executed. Also, for such report, a video showing the CPU figure over time is much better than a still picture.