Lagginess when removing variables from equations

[harper-wavra]

Ryan noticed a lagginess in the services "While completing equation edits in MT (10 equations per region), I noticed that the client seemed to have slower response times for each consecutive edit. I would often get a red warning box: "

"Sometimes happening multiple times in succession while trying to save. After a while (maybe every 10th equation or so) it would close with the following out-of-memory error:"

After digging into this a bit I think it only happens when removed variables from equations. Other things I noted:

• The laggyness still seems to happen even if I only select 3 or 4 of the peakflow equations, instead of all of them.
• If you are just editing the equation text and not removing a variable it seems to work fine
• I tried some requests to the services with insomnia. When it starts to fail I get the X-USGSWIM_Messages error about threading
• If you send the same request right away after it failed the first time it works the second time
• Seems to have no problem when adding a variable to each equation, just has issues when removing
• This makes me wonder if this has always been a problem and we were just never removing variables from multiple equations one after the other?