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I'm pretty new in this program, was doing my university project, and I'm making a little city, so i duplicated A LOT of buildings and trees and now blender works very very slow (its 10GB file). I recently found out that there is an opportunity to duplicate meshes without copying it as object(instances), but I'm already made half of the project. Is it possible, to convert all my meshes (or mb some part at least) and save it's transform and keys? Blender version is 3.0 Thanks!

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    $\begingroup$ Maybe you want linked duplications? In that case select your object(s), shift select the one you want to copy the mesh from, and press Ctrl L > Link Object Data $\endgroup$
    – moonboots
    Commented Dec 15, 2023 at 13:51
  • $\begingroup$ @moonboots I want to make blender work faster, i thought it could be possible, if I will turn all same objects into instances, what's difference between linked duplications and instances? $\endgroup$
    – Angleton
    Commented Dec 15, 2023 at 14:03
  • $\begingroup$ Have you tried Ctrl L? Because it may be what you need, if you use linked duplications (Alt D instead of Shift D or Ctrl L > Link Object Data as explained) the objects will share the same mesh, it will make your file lighter $\endgroup$
    – moonboots
    Commented Dec 15, 2023 at 14:10
  • $\begingroup$ @moonboots That was really nice! Thank you! How can I mark your answer as right? I'm pretty new at this site too, maybe somebody will need this too... $\endgroup$
    – Angleton
    Commented Dec 15, 2023 at 14:25
  • $\begingroup$ blender.stackexchange.com/questions/273060/… $\endgroup$
    – Emir
    Commented Dec 15, 2023 at 14:31

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Use linked duplications. When you duplicate your object, use AltD instead of ShiftD, this way your copy will share the exact same mesh and it will make your file lighter.

If you've already duplicate your objects but you want them to share the same mesh, select them all, shift select the one that has the mesh you want them to be linked to and CtrlL > Link Object Data.

Now if you edit the mesh of one of these objects, all the other ones will be modified as well.

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