I am curious, what tasks do you find where performance is an issue, I'm guessing it's not the office work or internet, is it building your projects? Do you use

I am curious, what tasks do you find where performance is an issue, I'm guessing it's not the office work or internet, is it building your projects? Do you use it for mobile development, what's your usual environment? I am using a late 2008 Macbook (Unibody Macbook 5.1) for the same sort of activities you use it and find it fine and that is worrying me a bit, I use it about 6 hours a day for my personal projects and entertainment. It originally came with 2GB RAM which I upgraded about 5 years ago to 4GB, then a couple of years ago I upgraded it to 8GB, which is the maximum it takes. I also replaced the 160 GB HDD hard drive with a 256 SSD, I replaced the battery once, and had to change the power adapter too. I've also upgraded the OS from Leopard > Snow Leopard > Lion > Mountain Lion > Mavericks > Yosemite. To be clear it's an original 'Macbook' which was phased out as a brand and recently (today actually) been reintroduced as the new 'Macbook'. The processor is an ancient Core 2 Duo 2.0 GHz but somehow I can keep managing to working on my Node.js, Xcode 6/Swift projects alright. I believe your Macbook Air is not upgradeable in the same way as my Macbook so this is perhaps the reason you are finding you need more performance. I'm not trying to suggest you don't need a new machine by the way, I am genuinely interested where you find performance becomes an issue because even though I am happy with my laptop some of my friends can't believe I am using this laptop as my primary (and only) machine so I do feel a bit insane sometimes. I once thought it may be that I've just gotten used to the slowness and don't notice it but I do use a high end desktop at my day job for C++/C# dev work on Visual Studio, and used the latest laptops at the Apple Store but only for browsing so it is hard for me to compare dev work. I really hope I'm not spending twice as long as everyone else compiling or doing other processor heavy tasks and just got used to it, that would be pretty stupid. Even the new Macbook 2015 which has what is considered a weak processor by the press has better benchmark scores than the processor in mine. Perhaps I'll go from my old Macbook to the new Macbook.