If you don't want to put it all as permanent settings of your server in Settings/Settings.lua
(line: "CustomSettingsAtLoad=")
...and you're asking about many cvars under one admin command usable any time you want to change all cvar settings at once - I've prepared it this way around 2 years ago for all of my servers as shown below.
I almost never use it anymore, but maybe at least this simple idea can be helpful for you somehow for fast switches.
Of course to place in ChatCommands/ChatCommands.lua file:
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[code] AddChatCommand("setlowgraph",function(self,player,msg,val)
ForceSet("e_sun",tostring(0));
ForceSet("e_view_dist_ratio",tostring(15));
ForceSet("e_view_dist_ratio_vegetation",tostring(7));
Chat:SendToTarget(nil,player,"Graphics were set to low for better FPS");
end,{TEXT},{AdminOnly=true;},"Sets low graphics for better FPS");[/code]
=====
You can add as many cvars you want and prepare commands like "setlowgraph", "setmediumgraph", "sethigraph" or something like that.
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