It would seem that you are aware of the issue. I will not dig any further but I will leave the portion of policy that states how SNAIL expects lag to be dealt with on race night. The following is taken from the host and driver responsibilities on race night section in the SNAIL Policies and Guidelines thread.
4. The host/director is responsible for handling any lag issues during the night. If a driver is lagging, the host/director should ask them to leave the room, clear their cache, and re-enter the room. The host/director should allow 3 minutes for the driver to take care of this. If the lag is still present, the host/director should ask the driver to leave for the night. If the host/director doesn't make the lagging driver aware of the issue and give them the chance to rectify the issue then the fault lies with the host/director. Most of the time, the driver that is lagging will not know it. Other cars will appear to have slight jittery movements to them. Meanwhile, the driver lagging will be flying all over the track with tires smoking.
3. If you are told that you are lagging badly and affecting other drivers, please do the considerate thing and leave in the middle of the race. You will receive last place points but you won't ruin the race for another driver. This will give you extra time to try and get your connection sorted and get back for the next race without holding up the room too much. It's better to get last place points for leaving early to get it sorted than it is to miss the start of the next race and get 0 points if you can't get back to the room in three minutes.