@Maxicifer: First of all, please double check that the feature is still enabled by heading to Settings > Battery and device care > Power saving > Tap the 3 dots in the top right > Adaptive power saving > On. Toggle Power saving mode off if it is currently active, then monitor the performance. Please keep in mind that Adaptive power saving toggles Power saving mode on and off based on your usage patterns, so if your usage has lessened recently, or you're not accessing power intensive apps such as games and streaming services as frequently, then this might explain why it isn't activating as often as before.
Another option that you might wish to consider is Adaptive battery, which can extend your battery life based on your usage. To enable this feature, head to Settings > Battery and device care > Battery > More battery settings > Adaptive battery > On. If it's already on, try disabling it to see if Adaptive power saving triggers more frequently.
