He's such a slowpoke, so I'm always kept waiting.
そんなのろまなやり方じゃ、日が暮れちゃうよ。
With such a slow way of doing things, it'll be dark before you finish.
He was scolded by his boss for being a slowpoke at work.
The slow-witted new employee is struggling to learn the job.
のろま is a blunt, everyday word for a slow-witted person, while 蛍光灯 in this sense is dated slang making a joking comparison to a flickering fluorescent light.
鈍い is an adjective for general dullness or slowness (of a knife, reflexes, etc.), while のろま is a noun/adjectival noun that labels a person as a dunce.
loris
Rare kanji form.
Rare kanji form.