Not sure if this helps, but, Make sure to turn labels off on the map, or use /mapfilter named to limit how much data the map needs to show. The harder your device has to work, the more likely you are to have a device fail to reset when zoning multiple accounts at once.
try setting each of your instances of EQ to a different processor core. EQClient.ini, look for the section that looks like this:
CPUAffinity0=-1
CPUAffinity1=-1
CPUAffinity2=-1
CPUAffinity3=-1
CPUAffinity4=-1
CPUAffinity5=-1
This was OLD CODE!!! IT HAS BEEN CHANGED BUT NOT REMOVED!!!
Now, look for:
ClientCore0=-1
ClientCore1=-1
ClientCore2=-1
ClientCore3=-1
ClientCore4=-1
ClientCore5=-1
ClientCore6=-1
These are the lines that matter for individualizing your EQ client instances to individual processor cores. Default value is -1 = use all cores. Any value larger than your physical quantity of cores is the same as -1, it will use all cores. The value range = 0 to (max-1) if you have 12 cores, your values will range from 0 - 11. Just like addresses for hard drives.
Say you want to reserve your primary processor for windows, and use your other processes each for a game instance, you could type in something like this:
ClientCore0=1
ClientCore1=2
ClientCore2=3
ClientCore3=4
ClientCore4=5
ClientCore5=6
ClientCore6=7
Notice I did not use =0. This means that as long as I do not load more than 6 instances, each will have a dedicated processor. Now, if you EVER load more than 6 instances... your client file will get a new line of code for a new ClientCore7, ClientCore8, so on and so forth. Their values will always be initially set to -1, which is to use all processors.
Couple other things:
1. turn labels off on your map. That's a LOT of extra data to constantly update and visually represent, with locations, names, all that jazz. /mapfilter named if my favorite as it limits what shows. I only turn that to hide if I am zoomed in on the map, so it doesn't overwork the system.
2. Turn off your Chat Log. Yeah, you are running an active text logger for each instance of EQ. Meaning, everything you do on all accounts is constantly being monitored to write text to a file. This is a lot of work. Especially when you do it 6 times at once.
3. micromanage your framerates. If you are laggy, have your boxes turn actor clip plane down, or clip plane down, or both.
4. Social Animations... turn them off... holy mother of all that is unholy... turn them off...
5. MipMap filter: cut that shit off. Just, don't even listen to it. It's crap.
6. Texture Compression: if your computer is still needing texture compression... I wonder how it has electricity from the dump. Turn that crap off. Not needed, and it makes you load, and compress a zone, increasing workload and load in times, whenever you zone in somewhere, and bloats the size of EQ horribly. If you have 6 accounts up, and all load into a zone at the same time, your computer is trying to compress that zone 6 times. Stupid. Turn it off. Just turn it off.
7. never assume it is just that MQ has gone awry. Every time there is an update, and added features, it makes each client work harder. each client makes your PC work harder. Sometimes, beating the horse with a whip gets results... and sometimes it just lays there begging you to kill it. This is what you're doing to your PC when you overtax it. No sense beating it when you've made it want to die already.
8. Check what texture group you are using (high-low)
9. Check what your RAM usage settings are on from least used to most used. Balanced is good, but remember, less RAM means more HDD calls for data. more RAM means less HDD calls for data. Choose the setting to suit your system. If you have badass M.2 drives with crazy speeds, use least amount if you wanna. If your HDD is a clunker but you got great RAM, use most usage.
These are just some debugging tips that have worked well for me over the years. Usually it comes down to finding a nice marriage between visual quality and performance. yeah, 2.0 shaders are nice, but i can do without. screw shadows. advanced lighting is and always has been crap. like... pick and choose your experience through settings.
If none of this helps with the crashing... meh... sorry. I will have to leave that to better and more experienced people. I am just a random 20 year forum lurker. /nods