This is exacerbated by the fact that most developers have nice, beefy machines compared to most people who will be using their products. Though we've also experienced the opposite in the case of server-side code. Improved a lot of little inefficiencies in our server-side code base through efforts to keep it possible to run on small VMs on developers' local machines. Things that we'd never notice on the monstrous 52-core 128GB of RAM infinity SSD servers, but show up quickly when you're giving it 2 cores and 4GB in a VM.