Thanks to Kepler satellite we know that the fast variability in cataclysmic variables
(CVs) is described by multicomponent power density spectra (PDS). It appears that these
PDSs are different in high and low optical states, with dominant frequency close to 1
mHz present in the high state only. Since this conclusions were based on low number of
CVs, we started a hunt for characteristic PDS frequencies in CVs using TESS
data. Previous works by various authors suggest different interpretations for the
dominant frequency close to 1 mHz. We search for characteristics able to discriminate
between individual scenarios, and we search for correlations with basic system
parameters. So far we can confirm that the frequency distribution really peaks near 1
mHz, these frequencies appear in systems with lower inclination than approximately 70
degrees, and they are not correlated with the WD mass. Finally, the source of the
dominant mHz PDS pattern is probably not connected to the inner disc radius at least in
the nova-like MV Lyr.