Hum interresting ! The log looks fine, no errors, your phone have plenty of power and should not struggle with Simhub, however i've already seen some devices triggering a thermal protection after a time (an old LG G3 in my case) which would seriously reduce GPU power at a level where everything went laggy) does your phone gets hot ?
It would be interresting to see when it occurs if a refresh of the page on the phone solves it. It would allow to understand if the problem comes from the computer side or from the phone side.
Also could you describe me the lag ? Is it totally and definitely laggy, or is it some recurrent lags ?
I will take a look on my side, web dash is really light on simhub side and does a very little things, but I know that rf2 with massive amount of data sent can generate a lot of pressure.
There are also some traps around such as windows update / antiviruses scan .... which can cause troubles, in the settings you have an option to give Simhub a higher priority and let Simhub breathe :
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