I previously had a DSMR 4.2 electricity meter, which has now been replaced with a DSMR 5.x meter. One of the main differences is the update frequency (yes!!):
- DSMR 4.2 → every 10 seconds
- DSMR 5.x → every 1 second
When I monitor the P1 port, I can see a new complete telegram every second, and the value of 1-0:2.7.0 changes each time. However, in Home Assistant this value only updates every 30 seconds.
If I set the DSMR option to 0 seconds, then sensors like sensor.electricity_meter_power_consumption and sensor.electricity_meter_power_production do update in real time, which is great 
However, other sensors such as sensor.electricity_meter_energy_production_tarif_1 also update every 1–2 seconds, since their values continuously increase. This generates a lot of extra data.
Is it possible to enable the 1-second update interval only for the power (consumption/production) sensors, without increasing the update frequency for the cumulative energy sensors?