Indexing speed of Google is slower than Bing

Since the launch of the Mx homepage, blog admin has been uploading 30 articles per a month (60 articles in total for the Japanese and English versions), so the number of index registrations has reached a reasonable level.
However, perhaps because of that, I feel that the speed from requesting indexing on the Google Search Console to actually indexing is slowing down.
Moreover, it is remarkable after the number of articles reached about 500, and it seems that 500 may exist as one delimiter in the upper limit of index registration.
This may be especially true for Mx, as it’s only a short time since Mx domain was created and there isn’t much traffic.
A comment on the solution from a Google representative states that the number of pages should be reduced to make the entire site more powerful, which is a problem for sites such as blog sites where the number of articles continues to increase. Isn’t it?
https://youtu.be/6Lu2F_y54fg

When I check the indexing using Microsoft’s Bing as a search engine, it seems that the indexing is fairly fast (within the day I posted articles), and Google feels slow.
I feel sorry for Google.
I feel that Bing is now better than Google.

Anyway, I will slow down the speed of posting new articles a little bit from the next month.