Slow render

[z_kash]

I am new with corona , But I was expecting a lot more speed , it took me over 20 minutes for 11 passes ; I cant seem to find the problem I am using Corona 1.5 , Corona portal material on the opening , UHD cache and the scene is a very small and low detailed interior , what else should i consider ?!
oh, and I have to mention that I Converted the materials from Vray to Corona using the Corona Converter.

[maru]

It looks like there is some persistent noise in your rendering coming from an incorrect light setup, reflective caustics, or something similar. It is hard to tell without actually knowing how the scene looks exactly. Any chance you could share it?
Meanwhile I can recommend you this article:
https://coronarenderer.freshdesk.com/support/solutions/articles/5000501983

[z_kash]

It looks like there is some persistent noise in your rendering coming from an incorrect light setup, reflective caustics, or something similar. It is hard to tell without actually knowing how the scene looks exactly. Any chance you could share it?
Meanwhile I can recommend you this article:
https://coronarenderer.freshdesk.com/support/solutions/articles/5000501983

I changed the file a bit; but I still have a noisy render after 100 passes , but the speed is better 
I am attaching the File and a Render , it would be great if you can take a look
Thank you very much :)

[arrival]

Hello z_kash
i changed sampling balance from 16 to 24 and the scale and position from your portal !
after 100 passes now i think it's clean .

[z_kash]

Hello z_kash
i changed sampling balance from 16 to 24 and the scale and position from your portal !
after 100 passes now i think it's clean .

Thank you very much , it's a lot better now :)