I have a 2017 TCL P series with the same latest versions of the Roku OS and Tablo app. The 10- 12 second time is normal when tuning a new channel since the Tablo has to transcode before displaying (this has always been the norm). When you change from the first channel to another channel, that also takes 10- 12 seconds since the new second channel also has to be transcoded before displaying. But when you switch between two channels that you have previously selected using the ‘last channel’ change feature, the display switches within 2- 4 seconds.
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