Ableton live 9.1 suddenly running slow no cpu load
Don't confuse this with a latency checker which tells the time it takes for an audio signal to complete it's journey, this tool checks how long your machine take to process all the Deferred Procedure Calls that are going on in the background. This tool can help troubleshoot stuff that might be interfering with the audio stream. Those kinds of tools might be great for gamers to help them thrash the last ounce of power out of their machines whilst they watch all the dials and knobs going round but they are the bane of a well-mannered Audio system.
ABLETON LIVE 9.1 SUDDENLY RUNNING SLOW NO CPU LOAD DRIVERS
ASUS suite which installs some pretty manky low level drivers in order to do it's stuff. Network setups, USB Devices and Virus checkers are also common culprits to look out for as are System monitoring tools that come with some systems and motherboards e.g. (Windows Search and indexing is a good candidate to turn off). The popular choices when this occurs is to make sure your device drivers are all up to date and working, uninstall and re-install if necessary, your chosen Windows poewer plan can make a big difference, as can tasks running in the background. There are numerous things that coulc cause these symptoms to start happening suddenly, updates, driver corruption, new software being installed, ad.
I'm assuming a Windows PC here as you mentioned ASIO4All.