speed vs damage calculations?

[Sky]

i was wondering if anyone has attempted a formula that balances speed vs +damage for ring of damage.

for example, i am currently +16 base speed, i have found a second ring of speed, +8, to replace a ring of damage +11. going from speed +16 to speed +24 should be a clear winner for total DPS, right?

as i understand it, if you have +speed in the region of +30 with gear OTHER than rings, then a ring of damage would actually help put out more DPS than another +10 speed.

+10 = 2 actions,
+30 = 3 actions,
+60 = 4 actions ?

has anyone ever, idk, built a DPS calculator? or even produced a formula? to be honest, i'm more looking for endgame (when ring of damage +14 is not impossible), but still curious as to what happens when you change, say, damage +11 for speed +4.