A year back I replaced the battery on my 2013 15" model - like the other commenters, I paid $199 at the Apple Store for a new battery, topcase, including keyboard and trackpad. I also recently bought a used 2015 Pro on ebay as a backup. I have a 2016 13" touchbar pro, and after replacing the original keyboard, I'm actually quite happy with it. But for the 15" model I just don't think the price is justified given the specs... my next mac might be a Thinkpad with Ubuntu and virtualized MacOS, sorry to say.
Virtualized MacOS because of Mac or iOS dev? Hard to imagine why someone would use a virtualized OS for normal usage or consumption. But maybe I’m missing something.
I used to work with a very wise and experienced designer who referred to this as the "zinc" (after the "sacrificial protection" used on the hulls of ships)
Over at 500 Startups we see a substantial number of founders and founding members who are in their 30s and 40s, and even some in their 50s and beyond.
This topic resurfaces every so often. Google will produce various articles and studies on the topic. Here's a study from HBR using Crunchbase API, LinkedIn, WSJ-
In my environment we've also observed latencies associated with some of the appservers referenced, so we rolled our own thin one with low-overhead in mind. We use multiprocessing as our means to saturate multiple cores, and avoid the nuisances associated with general-purpose multithreading.
The deck covers load-balancing but doesn't cover other patterns, such as the async variety. We increasingly use queues of various sorts. Zmq & mongrel2 offer really exciting possibilities, though we haven't tried the latter at scale so far.
