do you have the ASIO Guard enabled or disabled?
With the ASIO Guard enabled, the Average meter will have a higher reading, but the Real-time meter will be lower and probably won’t peak into red.
The other way around if you disable it. The results are slightly system dependant.
It is also possible to enable the Performance Meter in the MixConsole, which will only display the Average Meter and Disk Cache.
This way you can have an overview of the ASIO load and leave the VST Performance Meter (F12) disabled.
Of course, this is not ideal if you use one monitor, but cool if you have two.
If the real-time peak lights often, maybe check the buffer size and / or DPC?
On my personal home rig, I keep the ASIO Guard disabled because my Real-time peak is almost steady and barely oscillating, but when this is not the case it might be worth a try and enable it.
I mostly use 1024 samples buffer size except when recording - in that scenario, I sometimes enable the ASIO Guard, depending on how many plug-ins I have in use.