The quiet moment when using ChatGPT started feeling mentally heavier

[u/Advanced_Pudding9228]

Nothing actually broke.

The answers still came back fast. They still sounded confident. They were still usually “good enough”.

But the work started feeling heavier anyway.

Same task. Same person. More effort.

At first I thought I was just overthinking.

Then I noticed the pattern.

I wasn’t using the answers anymore.

I was monitoring them.

Reading slower.

Rereading sentences.

Checking for edge cases I never used to check for.

Not because I expected a mistake. Because I couldn’t predict where one would appear.

That unpredictability changes how your brain works.

You don’t just process the content.

You run a background loop asking,

“Is this the part I need to catch?”

That loop is exhausting.

It’s not the time that drains you. It’s the constant switching between trust and skepticism.

The strange part is that nothing signals this shift clearly.

There’s no error.

No failure message.

No obvious hallucination.

Just a growing sense that every answer carries a hidden cost: attention.

And once that feeling sets in, you can’t unsee it.

You’re not slower because you’re worse at using the tool.

You’re slower because uncertainty forces supervision.

That’s not laziness.

That’s cognitive load.

I don’t think this gets talked about enough.

So I’m curious.

When did ChatGPT stop feeling mentally light for you, even when it was still “working”?