I don't understand what trasactions you mean. chain or offchain?

Chain transactions (channel opening) can be slow if your fee settings are too low.

I think that 10sats/vbyte can get you to next two blocks now. So 20 minutes. LN nodes typically require 5 confirmations. Your channel should be ready in 60 minutes.

If we talk about slow LN transactions, then it's probably path finding issue. It depends how well your node is connected. More channels matter only when they connect to different and well connected nodes.

Given that I don't know how well you're connected to the ln network I can't really say anything helpful.

Node operators also set high fees on channels these days (probably did not adjustes back lower from high fee env we were in last half of this year). So if you cap/limit the transaction it can make path finding even harder ...