typing into an input field is sluggish/extremely slow on ios+chrome [closed]

Question

I am getting crazy.

If I open this url https://www.gomme-auto.it/pneumatici/205/55/16 on my iphone with chrome, and try to type on the large input field on top of the page, it's extremely slow and sluggish and barely usable.

If I open it in safari, it works just fine.

In any iphone simulator I tried, it works right. But on the physical device it does not. Tried with iphone5/iphone6/ipad-air both with ios 8.4.1 (latest).

I spent the last 12 hours trying to understand what's wrong, and I have not been able to identify the problem.

I checked some other websites, and I can not find other websites with this behavior, so it's my html, but so far I have been totally unable to find what is wrong.

Since in Safari everything works right, it's something linked with Chrome.

If anyone could help, it would be great.