Exactly how significant a buff is prisma'd diamond chef?

Title, like yes I know it's (bubble bonus*prisma mult). But how much would it buff my cooking speed overall? Just an estimate is enough.

Working out what to prisma next. It's either diamond chef, severapurple or multorange.

For reference, I have most meals at 111, the w7p1 meals at around 80 each and the w7p2 meals at around 60 each. On my first kitchen, with speed at lvl 507, and a blood marrow bonus of 1.23e41% at 7.94k meal levels, I have a cooking speed of 9.89e106/hr.