Things would also be significantly sped up if you compiled in production mode. From looking at your source, all the dev mode checks are still being performed. See:<p><a href="https:&#x2F;&#x2F;facebook.github.io&#x2F;react&#x2F;downloads.html" rel="nofollow">https:&#x2F;&#x2F;facebook.github.io&#x2F;react&#x2F;downloads.html</a> (the note under npm section)<p><a href="https:&#x2F;&#x2F;github.com&#x2F;facebook&#x2F;react&#x2F;issues&#x2F;1772" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;facebook&#x2F;react&#x2F;issues&#x2F;1772</a><p><a href="http:&#x2F;&#x2F;stackoverflow.com&#x2F;questions&#x2F;22118915&#x2F;how-to-turn-on-off-reactjs-development-mode" rel="nofollow">http:&#x2F;&#x2F;stackoverflow.com&#x2F;questions&#x2F;22118915&#x2F;how-to-turn-on-o...</a>