Good question! so I ran a sample Knime workspace with an ensemble of 3 random forest predictors that uses Titanic data (~1300 rows, 14 cols) on my 2021 M1 14" macbook. These were my not very rigorous results:
v4.5.2: ~ 3 minutes 10 secs
V4.7.0 (optimized): ~ 2minutes 30 secs
about 20% faster.