The effects of changing the colors is exacerbated in your case by the

fact that you use a bold face for some of the faces.

The changes is really annoying. In my opinion, a bold type font for keywords

and variable name is just too common in modern editor using a large monitor.

With the regular font style, it’s difficult to read the code.

On 20 Aug 2016, at 16:15, Eli Zaretskii <eliz@gnu.org> wrote:

Regardless of what Alan, the developer of the C++ mode says about
this, I think you can avoid at least some of the unpleasant effects of
this in your setup if you activate stealth fontification by setting
jit-stealth-time to some non-nil value, like 0.1.

Do you mean jit-lock-stealth-time ?

I set it to 0.1 (even 0.8) and nothing changes.