Unless you are running some really complicated globally distributed backend your roundtrip will always be higher than 80ms for all users outside your immediate geographical area. And the techniques to "fix" this usually only mitigate the problem in read-scenarios.
The techniques Linear uses are not so much about backend performance and can be applicable for any client-server setup really. Not a JS/web specific problem.
The techniques Linear uses are not so much about backend performance and can be applicable for any client-server setup really. Not a JS/web specific problem.