“A further step in this direction stems from the FIA’s decision to increase the pit lane speed limit from 60 to 80 km/h, thus reducing the time taken for a pit stop. According to simulations provided by the teams, the one-stop is still quickest, partly because overtaking is notoriously difficult at Zandvoort, with very few straights apart from the main one, combined with the fact the whole track is quite narrow." Pirelli wrote in preparation for the race on Dutch soil.
https://www.gpblog.com/en/news/fia-implements-major-change-for-dutch-grand-prix
Italian Motorsport reports that the FIA will raise the pit lane speed limit at Zandvoort to 80 km/h. The limit is also expected to be raised in Singapore and Australia.