What program/library is suitable for creating a 3D browser game?

Question

Game development

The essence of the game is as follows:
In 2D mode (top view), the user arranges furniture and characters by dragging them onto the room layout from the toolbar (arrangement of furniture is possible only in a predetermined place on the plan). After clicking on the "Start the game" button, the following should happen: the game goes into 3D mode and a room with furniture and people is shown, the characters move, music plays. There will be pre-prepared 3D models of real rooms and in the game it should look as realistic as possible.
Initially, the idea was to use Unity, but when importing a room model, the scene size is very large and will take a long time to load in the browser. Maybe there are some other programs or libraries that can be used to write a similar game? Thanks in advance for your replies.
PS Found JavaScript library three.js. Do you think it will suit my purposes?

Answer 1

but when importing a room model, the scene size is very large and will take a long time to load in the browser.

Do you think a smaller size will come out?

Answer 2

You want it to be as realistic as possible, but at the same time weigh less - this does not happen.

Answer 3

If the model is large, then it will be large everywhere, three.js will not help here. Most likely you don’t even have heavy models, but textures. Simplify the models, shake the textures and the problem will disappear. JavaScript is poorly adapted for 3D interactive applications with animations and music, I would not advise you to mess around with it, you will only waste your time.