However, the benefits of using this software heavily outweigh this 'speed' limitation.
The slow 'speed' cannot be avoided without making the whole thing custodial / trust-based. Keep in mind Bisq isn't even a company; but that's the cool thing, there's no central server, no central CEO to bribe or anything like this. Your PC, while staying on, is the server keeping your offer online.
It's also worth mentioning many of the fiat payment methods that are offered, are pretty fast, like Revolut, Strike and Instant SEPA.