My mid 2010 13" MacBook Pro is running Sierra 10.12.6 and I'm wondering if it's worth upgrading to High Sierra or beyond. I upgrade it's hardware last year to 16GB RAM, 480GB SSD and a new battery, so it's felt like a new machine. I'm comfortable with it and I don't see the need to buy a new laptop yet. But I don't want to upgrade the OS if it will slow things down. Any thoughts?