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There is a study that looked into this: Speed and Reynolds number of jumping cat fleas (Siphonaptera: Pulicidae)
I haven’t dove deep into this topic yet, but this is from the abstract:
Using strobe-lit video, jumping cat fleas, Ctenocephalides felis (Bouché), were observed tumbling, splaying their limbs, and landing in various orientations. Speeds averaged 3.6 m/sec, and ranged between 1.62 and 5.76 m/sec, 4 times faster than other fleas, Spilopsyllus cuniculi (Dale) and Xenopsylla cheopis (Rothschild). Average acceleration was -8.1 m/sec2. Reynolds numbers were 730 and 240, twice that of other fleas.