Fast Mode feed update mode

[AYakovleff]

Hi everyone,
I imported my settings from Tubular to PipePipe some weeks ago. The Fast Mode feed update mode was imported and has been working good with YT channels. However, after one announcement from PP about channel update failure I've disabled the Fast Mode in the dedicated PP dialog.
Now I would like to enable Fast Mode back on, but can't find any such option anywhere in settings. I have searched through all the settings and googled it too without any success.
Any ideas are highly appreciated.