Adobe Premiere Pro CC editing/playback performance Dropped Frames and Latency Woes
I recently switched from Final Cut Pro X to Premiere Pro, and I've run into a performance issue. To be clear, I've seen several questions about Premiere's rendering performance, but none about its editing performance. Since I started adding clips to the timeline, it has started dropping way more frames than I'm seeing during playback. And its latency for &quot;play&quot; and &quot;pause&quot; when I hit the spacebar has become very noticeable. None of these issues were present when I was sub-clipping.
Storage
All of the footage is located on my 1 TB SSD boot drive, where the application is installed. I realize this would be a problem if I was using an HDD, but with my SSD, I'm not sure it is. Full hardware specifications below.
The Question
What are the best practices for increasing Premiere's performance while editing and playing back in the application?
Hardware

Model Name: MacBook Pro
Model Identifier:   MacBookPro11,3
Memory: 16 GB
Graphics: NVIDIA GeForce GT 750M 2048 MB
Memory: 16 GB 1600 MHz DDR3
Storage: 1 TB SSD (55% full)
Processor Name: Intel Core i7
Processor Speed:    2.6 GHz
Number of Processors:   1
Total Number of Cores:  4
L2 Cache (per Core):    256 KB
L3 Cache:   6 MB
There are a couple factors which can be giving you lagy playback.You don't specify your bit rate or codec. If you are editing a processor intensive codec like h.264 (not a good idea) -the processor could start to be a bottleneck. If you are editing a less compressed format like ProRes your drive or RAM can start to become the bottleneck. Since that is the most likely, I'll address that: 

Because you have only one hard drive; Premiere is running off it, the OS is using it, preview files are trying to run off it at the same time. Easiest thing to try first is adding a hard drive or two. Ideally: Drive#1: OS/PPro, Drive#2: Project/Source Footage, Drive#3: Previews/Final Exports. If need be: put your Project and Source footage on an external drive and put your Previews on the local (fastest) drive. Once your previews are created, the project won't need to access the project and source very much. Use an "uncompressed" codec like ProRes or DNxHD for editing -a good SSD should be able to handle several streams at a time.

16Gb may be enough RAM, but it's not a given. It depends on the number of streams, bit-rate, size, length of the timeline, etc..