Why I observed gemini2.5flash (setting thinking_budget=0) is slower than gemini2.0flash?

Gemini API
1

I am using the example from official and only do de text generation.
Using same prompt.

gemini2.0flash
— 7.378899812698364 seconds —
Prompt tokens: 56292
Output tokens: 2009
Total tokens: 58301

gemini2.5flash:
– 15.149184942245483 seconds —
Prompt tokens: 56393
Thoughts tokens: None
Output tokens: 3311
Total tokens: 59704

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