If you want to know what's causing the jump you had ought to monitor Task Manager as you open each of the individual tabs you're using. 27% CPU and the amount of RAM you're seeing is unusually high.
I have both Chrome and Firefox open constantly, with double-digit numbers of tabs in each, and one with an incognito/in private window running and I have never gotten to anywhere near those figures.
I agree with the comment of jarlmaster47, but I would definitely want to know what it is that's causing that sudden kick-up in RAM usage and you can be pretty sure that it's going to be a single one of the tabs and it will show up either immediately upon loading the site in it or very shortly afterwards.
Brian AKA Bri the Tech Guy (my website address is in my profile) Windows 10 Home, 64-bit, Version 1709, Build 16299
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