The best replacement for input lag is response time.

The best alternatives to input lag are rated as following:
★★★★★  response time
★★  refresh rate

Your alternative for input lag is not listed? Suggest!
Speaking about input lag, one probably shouldn't forget about vsync.

Other search terms related to input lag and their ratings are:
★★★★★ vsync
You have in mind a companion for input lag and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of input lag in all years. Click on graph for more.
input lag
response time
refresh rate