Do I want DCR on or off?

Excuse me, could you possibly clarify something for me? I'm a bit perplexed about this setting. When it comes to the DCR function, should I have it activated or deactivated? I'm trying to understand the pros and cons of each option, but I'm not quite sure which one would be more beneficial for my usage. Could you please elaborate on the impact of having DCR on or off? It would greatly assist me in making a decision.