HACKER Q&A
📣 rishikeshs

Why are LLM UIs so slow?


I love Claude Sonnet but the user interface is super slow. After chatting sometime, it becomes too slow and its even hard to scroll.

To counter this, I tried Openrouter's chat interface, but that is painfully slow. I'm trying now Gemini 2.5 in Google AI studio and it is also slow.

What is the underlying reason for this? I understand the backend takes a lot of computation, but frontend?

  👤 lukejkwarren Accepted Answer ✓
It's the big bummer with reasoning models, although they are improving a lot. I experimented with various reasoning models for my AI security scanner product but found the performance to just be far too slow.