I have some heavy performance problems on Linux (Kubuntu 11.04, driver version 280.13), the view updates are VERY slow, sometimes I can't even pause a render and it's impossible to do anything else while rendering, because there is a view update just every second or so. Later in the rendering ...

It's a typical 'bug' in many glossy BRDF/reflectance models where light gets lost in reflections at grazing angles. In many render engines there are some kind of more or less good fixes, eg maxwell got it's glossy shader updated in version 2. Other engines, for example yafaray also suffer from this ...

I have no problems so far. Rhino-objs which previously crashed octane are imported correctly now. Vertex normal interpolation stuff works now as expected too. thanks!

Some shots of my lounge chair model (still WIP). All images rendered at low resolution and just for some minutes, I don't have the patience to wait longer as it's just so much fun to try new camera angles and materials! Need a new graphics card soon