A: Hi tran_hoang! 👋🏼

It would depend if you're using local or live optimization!

Live mode is more advanced but local mode tends to be more credit conscious.

For 7 websites I'd recommend either tier 3 or 4 depending on the amount of images for local or traffic for live.

We're happy to help however we can and answer specific questions as needed! 🙌🏼

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You can read more about how credits are calculated in the help doc below:

🎓How are Credits Calculated?
https://help.wpcompress.com/en-us/article/how-are-credits-calculated-1yectat/