Mesh and Part [ ASK SUGGESTION ]

I’m a beginner in building, can you tell me in which situation is better to use mesh part and in which situation is better to use only part/union/wedge ?
is the performance the same if we make blocks with rounded edges (mesh part) compare of using parts and cylinders to make the same thing?

Parts load the fastest because its installed into the client

For meshparts and unions it’s a matter of geometry,
a simple union is better than a simple mesh
Ex: Combining 2 - 4 simple baseparts together or negating

a complex mesh is more performant than a complex union
Ex: Weapon models/ Complex Building parts/ Anything with a good amount of detail in a small space

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