[w3c/IndexedDB] indexedDb The first time using the index query takes too long (#225)

usage scenarios:
mobile use webview
After the data is saved into indexedDb, the first time you open the page query is extremely slow。
Query code：
![qq 20171124181736](https://user-images.githubusercontent.com/17920500/33205976-c5d73bec-d143-11e7-9c0f-e9f39e495858.png)
The first result：
![1](https://user-images.githubusercontent.com/17920500/33206049-03b57938-d144-11e7-9263-f07e45277dd0.png)
The second result：
![2](https://user-images.githubusercontent.com/17920500/33206130-3e9aef6a-d144-11e7-9b65-47e3277b1bad.png)

How can I optimize the query?
or Where did I write wrong?



-- 
You are receiving this because you are subscribed to this thread.
Reply to this email directly or view it on GitHub:
https://github.com/w3c/IndexedDB/issues/225