To be honest, now I'm at my slowest ability of playing bass.
That's because I'm in the first months of 'Relearning my basic technique after 20+ years of professionally being a bassist/musician".
I work hard not to play faster than 60BPM (!!) in practicing Hanon. And man.. How not easy it is
Playing slow tempos is much harder than playing fast.
I would prefer two notes played in great timing, great articulation and good taste over 128 notes played with no other reason other than "look at me I can play fast".
I can play really fast, but on the day I can actually say that I can play "64th notes at 130 BPM" I think I can put the bass down and choose another profession.
There are musicians that want to show they can play fast, most of the time they will play ahead of the groove and will make the groove sound less solid and too anxious. When they need to lay down a heavy, fat, laid back groove they just can't.
Most popular music doesn't need fast playing. It does need good taste, space, groove, tone, articulation, personality and timing. Only being good at playing fast ignores all other things a good bass player should have.
Ask yourself when was the last time you played whole notes for at least one section of the song and felt you sounded so good you didn't need to play even one more note?