Opening a Previous Project Can Save Time

As we all know, generating a bitstream in Vivado can take several minutes. When messing around in Vivado and SDK, a lot of time can be saved by opening a previous Vivado file that has the bitsream already generated, and implemented design finished. Once the old file is opened, assuming all the work done previously is correct, simply click 'Open Block Design' in the Flow Navigator, and then click 'Open Implemented Design' a bit further down the Flow Navigator. Once these steps have been taken, you can Export to SDK, which is much quicker than creating a new project every time.