Unless you're using DNS over HTTP (DoH), you can speed up general DNS requests by running a local DNS proxy, and increase the expiry time of DNS queries. I'll go into this further once I've updated this post for DNSMASQ to do DoH.

The following configuration will speed up browsing in Safari for example.

Install DNSMASQ:

brew install dnsmasq

Load all configs from /etc/local/etc/dnsmasq.d/:

echo "conf-dir=/usr/local/etc/dnsmasq.d,*.conf" | sudo tee —append /usr/local/etc/dnsmasq.conf
mkdir -p /usr/local/etc/dnsmasq.d

Edit /usr/local/etc/dnsmasq.d/proxy.conf:

# Tell dnsmasq to get its DNS servers from this config file only.
no-resolv
# Add router dns
server=192.168.1.1

# cache for 1h
min-cache-ttl = 3600

Start DNSMASQ on boot and launch it:

sudo brew services start dnsmasq

Test:

dig cnn.com @127.0.0.1

Query time should be 0 the second time and an ANSWER SECTION should be returned. If that is the case open System Preferences > Network > Advanced > DNS > +

Enter: 127.0.0.1 and hit OK > Apply.

Improvements to the Events pages are in the works for 2020, too. You’ll soon see more functionality and a new look, such as the ability to set an alert on an event you want to attend, to follow your favorite event hosts, to share your event calendar with friends, and to see the latest event developments in a news feed. 

https://community.secondlife.com/blogs/entry/3016-the-return-of-last-names-and-changes-to-marketplac...

So if you open Recents in the sidebar it's likely it's full of files you have no idea you recently opened. It's most likely that you didn't. We can make Recents more useful by restricting the last opened date, and make using it more convenient. This is how:

1. Open Finder, then Recents in the sidebar.
2. From the cog menu, select Show Search Criteria, add a criteria via the plus button.
3. Change the filter name to Last Opened Date within last 14 days and press Save.
4. Name it My Recents, and enable Add to sidebar.
5. From the sidebar, drag the smart search into the dock next to the Trash.
6. Optionally remove the recents icon from the sidebar. You can restore the item via Finder > Preferencers > Sidebar by dragging it back in.

As a bonus tip, update  the icon for the smart search (just like any other folder and app) as follows:

1. Open /System/Library/CoreServices/CoreTypes.bundle/Contents/Resources/ and search for "Recents" to find the current Recents icon, or choose an alternative.

2. Right click on the My Recents icon in the sidebar and choose Get Info.

3. Drag the preferred icon from the folder into the icon slot in the top left of the Get Info window.

This changes the icon in the window title, but I haven't found out how to change it in the sidebar.

#macos

If you're working with two SSH keys (work / personal) then the following setup is quite elegant. It assumes all repositories are work related, unless they're hosted under your own user:

Host *
  AddKeysToAgent yes
  UseKeychain yes
  StrictHostKeyChecking no
  User git
  IdentityFile ~/.ssh/id_rsa_corporate

# personal account
Host github.com-MYUSERNAME
  HostName github.com
  User git
  IdentityFile ~/.ssh/id_rsa

#ssh

A new OS, another two hours wasted. Pop!_OS 19.10 comes with Python3.7rc5, which is nice but my project requires 3.6 just now. As you know we've gone through this before, but this time we can setup multiple python version support.

Let's setup pyenv, pip, pipenv and then install another python version.

# Setup pip.
curl https://bootstrap.pypa.io/get-pip.py | python

# Pip can setup pipenv.
pip install pipenv --user

# Manage multiple python versions through pyenv.
# @see https://github.com/pyenv/pyenv/wiki/Common-build-problems
sudo apt-get install -y make build-essential libssl-dev zlib1g-dev libbz2-dev \
libreadline-dev libsqlite3-dev wget curl llvm libncurses5-dev libncursesw5-dev \
xz-utils tk-dev libffi-dev liblzma-dev python-openssl git
curl https://pyenv.run | bash

Follow the instructions to add pyenv to the path. Now we can do stuff like:

# install another python version.
pyenv install 3.6.9

# OR let pipenv do it.
cd ~/dev/myproject
pipenv install --dev

Leave a comment if you have any issues, as this was written retrospectively.