Data from yesterday VN34 flight [OC]

It seems that rumours of incorrect weight or other data inputed by pilots can be put to rest.

ADS-B data aren't granular enough to be very precise, but compared to two previous flights (one with same aircraft), it seems that everything was going normal up until \~V1 speeds and then acceleration....almost stopped. They gained just 20kts while passing 2km of runway.

Performance seems to be normal after takeoff (even slightly higher), so issue seems to be only from about V1 speed until takeoff. Brakes are possible explanation (or something else ground related), or it was something pilots were able to remedy in literally last second