What is the effect of webp format picture file on the website?

everyone thinks:
1. For example, I upload a jpg image (original image 800k), which is converted to webp format (80k) after uploading, which only takes up less online storage space
2. You can browse the jpg diagram of the same name in the webp file through the program, for example,
www.abc.com/img/1234567.jpg?90x60 (webp file is 1234567.webp)
convert the corresponding webp file to jpg file with the size of 90x60

through the above link.

I wonder if I understand the above situation?

question point:
1. Using webp to jpg online, for example, the original size of webp is 900x600, is the jpg user converted into 900x600 equivalent to downloading two files, a 900x600 webp and a transferred 900x600 jpg, so the opening speed of the web page is not slower?
2.webp is only for the purpose of converting parameterized one graph to multiple graphs. Is this function convenient?

Please tell me about it from experienced friends. Thank you!

Webp php
Mar.31,2022

first of all, the image conversion operation should not be completed in the backend, you asked www.abc.com/img/1234567.jpg?90x60, returned is the webp format of the image, in fact, only downloaded a file.
the second point is that images of the same size in webp and jpg format will have a much lower volume, which will greatly save server bandwidth and space.

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