Just made a behind the scenes change that could impact players in older browsers or on some mobile devices. If you just started to have issues like in the last 30-min it is likely related. Let me know what browser + operating system as well as detailing the issue you are having.
My computer is getting really laggy when I play free rider, not sure if it is related to this. I am using the latest version of Chrome.
Maybe your computer has a slow processor. Or, you've installed too many useless extensions and apps. It's best to play frhd in the incognito mode of google chrome as this disables all extensions which might consume memory or processing power.