Is your feature request related to a problem? Please describe.
Writing big BC files can take quite some time. 100000 rows take about 30 seconds.
@veenstrajelmer noticed that the conversion from the ForcingModel to the serializable data takes the longest, while the writing of the file is very fast.

Describe the solution you'd like

• Investigate the performance of the BC file (and INI file) serialization.

The script from Jelmer can be used for performance testing:
https://github.com/openearth/dfm_tools/blob/master/tests/examples_workinprogress/workinprogress_hydrolib_bcwriteperformance.py
This code can be pasted into a test file as follows:
test_performance.txt

The test can be run with printing statements via the terminal as follows:
pytest tests\test_performance.py -rpP