Contour extraction from lidar data - issue in performance.

I created the contour from Lidar data using .LAS file. I am facing few issues after created the contour. 

1. After created contour the performance of the model is very very slow for small area. If i zoom in it took minimum 2 to 3 minutes to see the contour in the model. for zoom in / out itself took so much time. I am not sure whether i need to check any setting? 

2. Then I tried to on "spot elevation" for the same terrain model it is keep on loading for a long time then also i am not able to see spots elevations. 

It will be great support if you help on the issue. 

Thanks & Regards,

Prema Srinivasan. 

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