Be aware of the timeout occurs due to network load when opening the file on Excel Online.
I am aware of the behavior the timeout has occurred when opening the file which contains multiple functions in an Excel file due to take a time loading the file.
In our operation, we frequently use the file on Excel Online. So that, I hope the function will be able to support the function display properly, ensure the system works without a timeout error even if it takes a time to load, and build a network equipment that could withstand the network load in the future.
Tak Hamada commented
The problem raised is what happens when VLOOKUP references another sheet in the same Book.
Timeout happens when many VLOOKUP is executed.
I think the same thing will happen by other function.