Ok mate...you seem a little confused? first off what OS are you running and what are your system specs...Maya uses a fair bit of resources when the geo gets complex...so post your specs as well.
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As Genny has pointed out delete the history and use the script she posted to hide things that dont need to be there. Also if you group the model correctly or put them in their respective layers you can hide them through the outliner...by selecting the un needed parts in outliner and using 'ctrl h'...this will hide what you dont need to see.

Also how dense have you made the model...mesh wise. If you have smoothed the model too much Maya will take time to calculate all of these points...

Here is s trick (thanks to LOZ) that also might help....got to Display>Heads Up Display>Frame Rate...and tick it...this will display the frame rate the PC is using while you model on the bottom right of screen.

Then in the viewport go Shading>Interactive Shading and click on the options box..then make sure the 'Interactive Shading Mode' is set to bounding box...then hit close. Then again go Shading and just click on Interactive shading to turn it on. Now when you pan/tumble the model should revert back to a wireframe and low poly..this will take less resources...when you stop moving it will turn into the high poly and textures...try that.

Cheers bullet