SourceTree 3.1.2 Mercurial on Mac is unbearably slow (Invokes Python 5 times?)

[kraybit]

Hi!

Just created a fresh local repos, added 2 files, 2 commits. Looking at one files takes 5 seconds. During that time it seems at least 5 new Python processes are started.

Is this normal?

Attached GIF screen capture, not sure it works here, but it shows how it looks. (It may look like one Python process, but look at the PIDs.)

SourceTree 3.1.2 (216), using Embedded Mercurial 4.6.1, macOS 10.14.4

Kind regards

[kraybit]

Found the Debug menu.

These are the commands being issued in the above sequence:

So 7 invocations of Python. These are all the arguments:

diff -y -U 3 --change 1 path:hello.txt

cat -y -r 1 path:hello.txt

log -y --template {node}␞{parents}␞{date|isodatesec}␞{branches}␞{author}␞{desc}␞{tags}␞{svnrev}␞{node|short}␞ -r 1

cat -y -r 0 path:hello.txt

cat -y -r 1 path:hello.txt

log -y --template {node}␞{parents}␞{date|isodatesec}␞{branches}␞{author}␞{desc}␞{tags}␞{svnrev}␞{node|short}␞ -r 1

cat -y -r 0 path:hello.txt

Thinking out loud:

• The 'export/log/export'-trio is executed twice, with exactly the same arguments?
• What's the 'export/log/export' about anyway? Is it really necessary? Isn't all the info needed to refresh the view given by 'diff' alone?

[kraybit]

Sorry for chain posting.

I tried to disable all the Sourcetree › Preferences › Mercurial - Extensions I could (shelve, hgsubversion, hgflow), and the timings improved:

Better, still, this seems weirdly slow to me.

This is what 'diff' takes using Mercurial 4.9.1 from MacPorts:

What is going on?

Also, is there any way I can use Mercurial from MacPorts in Sourcetree instead? (It's not installed in any 'site-packages'-folder.)