Suspect fuel filter getting blocked or the gauze screen on the inlet to the fuel pump obstructed - usually both inside the tank, usually a real swine of a job getting to.

Also worth checking is are the battery terminals tight and clean.

There are onboard diagnostics in Suzuki FI systems which display error codes on the dash display but you need to know where the diagnostic plug is, the diy method is to use a paper clip to short two of the pins to get the display into dealer mode to display the codes, but you need to know which pins if it's a multiplug. The dealer should have a diagnostic tool which just plugs into the diagnostic plug, and a box with a switch on it.

Does it recover and run normally again if you roll the throttle back to halfway, after it has bogged down?

It could be fuel flow, it could be a badly-fitted airfilter, or the inlet snorkel of the airbox could be partially blocked. I would strongly recommend checking the air filter snorkel, airbox and filter just in case. Ask me why I recommend this :-)

As Focussed said, a look on the Bergman forums will probably show you where the connector for the 'diagnostic special tool' is (I have a Suzi SV650 which uses the same method).

I'll take a stab and say it's unlikely to be a faulty TPS - if it works fine for the first half of the throttle travel, it's probably OK.