W540 touchpad - erratic behavior in Windows 8.1

This is not a rant about the touchpad design - I'm actually not too bothered by it.
I'm having major issues using the touchpad even with the latest W540 drivers on Win 8.1. I have v18.0.7.57 which is the latest available as per Lenovo's downloads site. The cursor movement locks up for several seconds, then starts highlighting text I haven't selected, scrolls when I'm not using 2 fingers etc. Overall, it's very annoying. I have disable 'tap to click' and this helps a bit, but I still have the locking issues. Also, 'Synaptics touchpad 64 bit enhancements' is one of the top CPU consumers on the system, especially during the lockups - I can't imagine why an app that handles input should be consuming so much CPU!
I have uninstalled, reinstalled (rinse, repeat) several times and haven't found any improvement.

Hi W540_tp,
Thank you for the reply!
Please check with downloading the driver from the given link. It’s directly from Synaptic driver’s page.
Hope this helps.
Best regards,
Hemanth Kumar
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