Thanks jeff for your efforts.

I know there is lots of layers, and also I tried moving everything to a Layer0 which is sketchup default layer I believe but nothing changed in that model that you tried.

Well I realize something I'm not sure about it but, SU automatically smooths some edges I think?

I mean each Height Level (contours) was COMPONENT when I imported from autocad anyway, yesterday I exploded them to make it GROUP to get rid of components, and to make it just single geometry. Maybe that causes such behaviour like this..

Now I think, SU changes or soften some edges in every "make component/explode" situation in bigger geometries, models.

This is the model that Im talking about.
I didnt tried on this before, shame for me

If you still interesting you may check this model with unexploded height contours components.

Looks like problem solved spontaneously for me . fyi, this 2nd model that I upload have much more edges than other. Thanks for your time.

Hi there,

Im really pissed off, so quickly heres my problem and story.

Im using;
SU Pro 2014 and 2015 on Win 8.1
SU Pro 8, 2013 and 2015 on Mac OSX 10.9.3

I draw some contour lines in Autocad 2014 as SPLINE,
(Heres the .DWG file if you want to look)
Then I import it to SU and pushpull and stuff..

(And heres the zipped .SKP file I want you to download it and give a try)

Here is the problem;
I tried same file on WIN and MAC, and all versions that I have.

On WIN: When I try to draw a line its starts to Lagging. Blue dot on surface follows the cursor without lag which is okay. But When I click and move mouse around line just follows 1 or 2 seconds later. Some times its dissappear, and I cant see what Im drawing. Erasing a line in windows its just okay, no lag.

On MAC: With the same .skp file, same statistics, same stuff I tried.. I can draw a line without lag. But I cant erase the line without lag. Its like Im moving over the line, and 1-2 second later line gets blue, and again 1-2 second later line dissappear. It is took my 3 seconds to erase a single line.

Win;
i7-3820 @ 4.00 Ghz, 16gb Ram, GeForce GT430
Mac;
i5 @ 2.4 Ghz, 10gb Ram, Intel HD 3000, MBP-Late-2011

What could it be the problem? The Groups says try without Hardwareacc. but yes I tried nothing happend. And also FYI I dont have any lag problems on Rotating or Panning or Zooming.
Well Im currently, tearing my hair out.
Thank you.