From your description it sounds like some configuration setting. I went through the config gui and it wasn't there. It may be in an ini file or something. I recently ran into a barely documented chained app time limit error that required a .ini or .config file addition, not change what was there but adding an override.
Getting the exact message will be very helpful. 1000mb is common and fast in my situation.
Most often my gallery bugs don't match my first hunch. If you can rdp to the gallery server and run on that machine's desktop Alteryx as the gallery service account (or work with you admin in a screen share to do it) is usually the fastest way to the root of most problems. While you're on the server make sure it has more memory than your desktop. If that doesn't work here's the tedious way...
Put everything except the first input into a tool container,
disable the tool container so only the first input tool runs
Add a csv output tool to show what was read by the first input tool
Save to gallery and run.
It should either fail with an error or run the first tool and show you what the tool read after it finishes.
If it fails you should get some kind of error message
If it runs then your problem is happening downstream, move next tool out of disabled tool container, move the output csv to return output of next tool, run again
loop until it fails
