Static Lights in large numbers in Stream levels

I have strange problem.
In my Persist level have streaming level with 1000 static lights and lightmap. Level have 30-50 objects.

When in game I load strem level - game freeze for 5-10 seconds for loading level.

Why is this happening? All lights was build, but I feel like game load level with lamps, and its freeze game.

I dont understand =(

For relieve the load stream level with OMG big count of small lamps (tested with 3.000 lamps(really)), in parameters of lamps need uncheck 2 parameters:
-Cast Dynamic Shadows
-Affect Translucent Lighting

Then speed of load level up to skies! =)

Thanks, Den!

Your wellcome, Den! =)