Slow scrolling in `Movies` and `Series`

[doup]

Scrolling is really slow for both the Movies and Series.

Technical details:

• Butter Version: 0.3.8-5a
• Built from source code
• OSX El Capitan
• MacBook Air mid 2012

[YIFYtorrents]

Probably to much people are trying to access the APIs at the same time. The APIs are just slow.

[doup]

Well, the issue happens even when the contents are already loaded. Few things that I've noticed:

• Once few pages are loaded, it still lags on the first page (top rows). It doesn't seem that it's generating new requests since the terminal remains quiet.
• It has some moments of smoothness, but if there is a pattern I can't see it.
• I've seen that sometimes it loads new content even in the middle of the page (probably unrelated).
• Finally, but not least, nwjs helper goes to 100% CPU usage when scrolling.

Few ideas:

• An expensive calculation when scrolling?
• Synchornous code somewhere?
• It's just queueing lot's of requests?
• node-webkit issue (like #2723 or #3029)?
• My computer is getting old :-) (last year version worked quite well...)

Tell me if this helps somehow, or if there is anything I can do to better delimit the issue.