Hi, I am using SketchUp Pro 2021 on windows 10, and wondering if to make my mirror reflect the objects in the room. I there a way to do it without purchasing an extension, or perhaps is there a free one? Thank you!
Typically that sort of thing is done in rendering by giving a surface a mirror property. If you are wanting to do that in SketchUp without rendering, copying and flipping as you did in that model you shared would be the way to do it. Obviously that creates issues due to the increase in entity count. Although cleaning up and streamlining components in your model is important anyway, it becomes doublly important when you double the amount of entities. Strip out the unneeded stuff and reduce the rest of it. Maybe use Skimp to reduce the entity counts in the components.
Yes, thank you, doubling is an option, but then again, as suggested, it takes up a lot of space. Would it work with the plugin of LightUp to have the highest reflection perhaps?
I haven’t used LightUp for a decade or more but I would expect you can set up a reflective surface for the material you apply to the mirror.
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Sorry, what is the Charles Dodgson method?
I am about to purchase LightUp, it seems great, would you recommend another option since you say you haven’t used in a while?
There are lots of options. I’ve used Kerkythea for about 16 or 17 years and it works fine for my needs. Many folks like Vray. Before you buy anything you might give a few different versions a test run.
I had a look at the one you suggested, to my dismay, not for Pro 2021 
For SketchUp 6, 7, 8, 2013, 2014, 2015, 2016, 2017 and 2018 (Make or Pro)
It works just fine in SketchUp 2021. I made this quick render in Kerkythea this morning for an example for someone else. No intent for it to be photorealistic.
This was also a SketchUp 2021 model rendered in Kerkythea. Then some post processing done to the image.
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FWIW, this is what the OP had already done. Due to the excessively detailed components in her model, she was starting to run into performance issue.
My little joke. His pen name is much more well known than his real one. The second part of his famous book (1872) is called “Through the Looking-Glass”. That is how this was done.
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If you make a component of what is to be seen in the mirror and only flip that component, your model will not increase too much unless the component is very very heavy.
That’s true. Of course in Belle’s model even the table napkin group is huge. And there’s a dozen of them.