I was not familiar with UC Browser, but according to Wikipedia:
The web browser increases speeds by not loading web pages on the phone, but instead compressing and rendering them on a server,
[1] similar to the operation of a
thin client.
I'm guessing this is the "speed mode".
I would not expect much if any success with this, unless UC Browser specifically supports jQuery Mobile. I doubt that there is anything that could be done from the client side to fix any incompatibility.
I would think it would take some cooperation between the UC Browser developers and the jQuery Mobile Developers to support JQM.