The Superhero Database Classification number, or SHDB Class, is a number that represents the overall 'power' of a character. All traits of a character are used for calculating the Classification.
What it DOESN'T mean
This doesn't mean that a higher class would always beat a lower class character. But the bigger the difference in Class is, the more obvious it is who'll win in a fight.
How is this calculated
( INT^1.3 + (STR*0.5 )^2 + (SPE*0.5)^2 + DUR^1.6 + (POW + (SPS*SPL))^2 + COM^1.8 ) ^ TIER
Super Power Score and Level
Every Super Power has a score (SPS) that is used to calculate the Class. Each Super Power also has 3 levels (SPL). The level is set when connecting that Super Power to a character. The level determines the final score, of the Super Power, being used in the calculation.
Here Ladybug dodges and outruns flashlight from Pixelator's camera (which would otherwise warp here into another dimension, if it hit).
So Ladybug is literally (because she's faster than a flashlight) Faster than Light at least.
I cannot even remember all the countless instances when the main characters in Miraculous was forced to move faster than light (typically because of Lasers that were aimed at them).
ofc Chat Noir scales to (and likely even slightly above) Ladybug, speed-wise, too.