Is there a technical limit to DPS?
There is a technical limit to the visible DPS on a skill popup, due to that being stored in an integer variable. There is a technical limit on the amount of damage a given hit can deal (same dealio), but to my knowledge not a technical limit on the number of times you could hit a target in a second, so I do not believe there’s a technical limit on actual DPS dealt to a specific enemy.
There is definitely a mechanical limit to DPS, because there are limits on how high the values of stats you can obtain from passives/gear/etc. There is some theoretical “best DPS” build that could exist with perfect gear, that would have more DPS than any other actually possible build. This limit is significantly below where any technical limitation would occur on actual damage.