This poster solved a similar high CPU usage by installing a bitcoin mining blocker. Might give it a try....would also be another data point as to whether IB's ad service is allowing bitcoin miners to slip in:
https://www.flyertalk.com/forum/29114024-post658.html
Originally Posted by
TomMM 
Getting a lot of the same ads hijacking my phone as recently as this morning.
One thing that has been reported in the news lately is the use of Javascript Cryptocurrency Miner by some sites.
https://techcrunch.com/2017/10/13/su...f-other-sites/
But I think I found a solution to the huge CPU and memory usage in Chrome on Windows. I installed the "No Coin" extension that blocks coin mining in browser and that has drastically reduced CPU and memory usage on FT.
You guys have a real problem with ad quality control since you're allowing coin miners to hijack your site.