Wekan author here. On my computer hot reload takes roughly 5s [Thinkpad T440s, ubuntu, 12go of RAM]. I'm not sure if the jade and stylus compilers add some time in the case I only modify JavaScript files, but anyway I plan to migrate these two package to support the new compiler API.
Still 5s is far from ideal considering the development experience with webpack and React hot loader.
Still 5s is far from ideal considering the development experience with webpack and React hot loader.