The Android 8.1 developer preview has been available for Google Pixel and Nexus phones for a few days. It brings very noticeable and important performance improvements.
TWO WORDS: BUTTERY SMOOTH
The Android 8.1 update bring changes that make scrolling and the overall experience much smoother. This can be tested if you have updated and original Google Pixel. The improvement in terms of performance is definitely noticeable.
The Android 8.1 is still a developer preview at the moment, so you have to wait for the official version to arrive to your device.