Lightroom does exports in the background while you are working on your images.
I do accept that it might run a bit slow depending upon your computer configuration.Here is a similar feedback Lightroom 6 / CC2015: Very slow UI response with background export(s) running
export cue - where you can cue up all the exports from different jobs/projects so that when its tea oclock you can hit the export button and set it running
I like the Idea and this could be a handy feature.You could share your valuable feedback with us here Photoshop Family Customer Community .
I did my plus one thing , seems there enough similar ideas out there without me creating another feature request. My export queue could just be a subset of you're scheduled tasks.
Akash - yes as I said I know it exports in the background already - its just that " its virtually unusable whilst its happening"