Fix delay between blur image and high res image (#25994)
Fix delay between blur image and high res image (#25994)

Previously, we had an arbitrary delay of 1500ms but instead we can wait until decoding is complete.

Co-authored-by: Kristóf Poduszló <037fbd6ee6e61869436737285c30254aa0154a5d@protonmail.com>
flybayer/next.js,JeromeFitz/next.js,JeromeFitz/next.js,azukaru/next.js,zeit/next.js,JeromeFitz/next.js,flybayer/next.js,flybayer/next.js,azukaru/next.js,zeit/next.js,zeit/next.js,azukaru/next.js,JeromeFitz/next.js,flybayer/next.js,azukaru/next.js