I was wondering what kind of battery performance other owners of the top-end MBP 15" Mid-2014 (w/ NVIDIA 750M) are experiencing and would love to hear your thoughts. My system stats via coconutBattery: Age: 22 Months Load Cycles: 980 macOS Battery Status: Good Design Capacity: 8440 mAh (same for all) Current Battery Capacity: 87.7% Usage: Usually push the laptop to its limits (CPU + GPU) while video editing and GPU while gaming (Win 10 BootCamp) as of today. Case: New Performing fantastic on both Windows & macOS for both tasks - while plugged in as well as on battery. Example Game: Need For Speed Rivals Able to play at optimal performance at 1680x1050 with mid-high settings (NVIDIA GeForce Experience optimized settings). OS at the time: Windows 8/8.1. Video Editing: Perfect! OS at the time: 10.9.3/4 Mavericks. Case: After 22 Months Performance nearly good compared to the above case on both Windows & macOS for both tasks, but only on battery. Plugging in causes throttling - but works fine if I cool the environment around (Air Conditioner - cooler than I would prefer). However, GPU-Z does not show the cause of throttling as Heat. My guess is that it is mostly due to the limited 85W PSU, but that does not explain great performance in Case: New. My guess is: with a degraded battery, charging is inefficient? (maybe requires more time & power?) - would love more information on this. Example Game: Need For Speed Rivals Optimal performance at 1280x800 with mid settings (custom). OS at this time: Windows 10 Pro While the OSes are different, I have seen consistent minute performance improvements over Win 8.1 in all reviews. So a performance degradation is doubtful with Windows 10 (have tried all possible energy settings thoroughly). Video Editing: Perfect! El Capitan has really resulted in much better performance and RAM management (have noticed that it uses much more of the GPU than before - probably thanks to Metal). OS at this time: 10.11.5/6 El Capitan. While the OS has improved performance, tools have shown me low CPU clockspeeds while converting video via handbrake while plugged in (all 8 threads - drops to sub 2.5GHz frequently, average around 2.(5-7) GHz and starts at 3.1/2 GHz. When new, I consistently averaged around 3GHz. I am also aware that OS X also made changes regarding the charging policy since Mavericks. Before, if the computer demanded more power than the PSU could supply, it would be given this power via the battery, resulting in a not-charging situation or sometimes even a decrease in battery. Now, the battery has to charge at all costs, hence the CPU/GPU throttles. Another example that corroborates an overall performance decrease in my Macs performance is a review of this model. Check out this old review: http://www.macworld.co.uk/review/mac-laptops/macbook-pro-retina-review-15inch-2014-3533760/ The Unigine Heaven benchmark states that @1440x900, the system averaged 29FPS. Given that the current version (4.0) has been around since 2013, we can assume that both the reviewer's and my machine ran the same version at his suggested "Medium" settings. The OS however, must be different since my machine is on El Capitan. I scored an average of 20-22FPS on the test on macOS, both plugged in and on battery. I was wondering if anyone else is experiencing lower performance (in normal use cases this may be visible) after prolonged intensive use and if it would be wise to change my battery (and that doing so might improve performance?) given that its current capacity is still at 87% which is sufficient.