From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Aaron Jensen Newsgroups: gmane.emacs.bugs Subject: bug#24048: 25.0.95; syntax-ppss can be slow Date: Mon, 25 Jul 2016 15:08:11 +0000 Message-ID: References: NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/related; boundary=001a114644cab416cc0538772744 X-Trace: ger.gmane.org 1469459374 12535 80.91.229.3 (25 Jul 2016 15:09:34 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Mon, 25 Jul 2016 15:09:34 +0000 (UTC) To: Dmitry Gutov , 24048@debbugs.gnu.org Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Mon Jul 25 17:09:18 2016 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1bRhVK-0005FV-Kn for geb-bug-gnu-emacs@m.gmane.org; Mon, 25 Jul 2016 17:09:14 +0200 Original-Received: from localhost ([::1]:32886 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bRhVJ-0003HC-QC for geb-bug-gnu-emacs@m.gmane.org; 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boundary=001a114644cab416c80538772743 --001a114644cab416c80538772743 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On Mon, Jul 25, 2016 at 5:42 AM Dmitry Gutov wrote: > Is 5.6ms really significant? You should be typing like 200 characters > per _second_ to really notice the difference. > > Even 12ms that I'm getting at the bottom of your example file doesn't > sound like it should have effect on the perceptible latency. > That=E2=80=99s a totally fair question, but yes, I can feel the difference = while typing. Ever since switching to Emacs I could feel significant latency in my setup so I=E2=80=99ve been on a quest to bring it down. That quest led m= e to smartparens and first to that case-fold-search binding issue and now here. Even if one can=E2=80=99t feel 5.6ms, it becomes another brick in the bag, = i.e. if another minor mode did something similar and added another 5.6ms. With enough of them most people could probably feel it. If you haven=E2=80=99t read it, I recommend looking over https://pavelfatin.com/typing-with-pleasure/ He has a tool on there for measuring typing latency. Here is a histogram of the difference between typing at the bottom of the sample file, the top, and the bottom with memoizing syntax-ppss in smartparens: [image: Bottom VS Top VS Memoize Bottom.png] --=20 Aaron --001a114644cab416c80538772743 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
On Mon, Jul 25, 2016 at 5:4= 2 AM Dmitry Gutov <dgutov@yandex.ru<= /a>> wrote:
Is 5.6ms really significant? You should be typing like 200 characte= rs
per _second_ to really notice the difference.

Even 12ms that I'm getting at the bottom of your example file doesn'= ;t
sound like it should have effect on the perceptible latency.

That=E2=80=99s a totally fair question, but yes, I ca= n feel the difference while typing. Ever since switching to Emacs I could f= eel significant latency in my setup so I=E2=80=99ve been on a quest to brin= g it down. That quest led me to smartparens and first to that case-fold-sea= rch binding issue and now here.=C2=A0

Even if one = can=E2=80=99t feel 5.6ms, it becomes another brick in the bag, i.e. if anot= her minor mode did something similar and added another 5.6ms. With enough o= f them most people could probably feel it.


He has a tool on there for measuring t= yping latency. Here is a histogram of the difference between typing at the = bottom of the sample file, the top, and the bottom with memoizing syntax-pp= ss in smartparens:

3D"Bottom
--
Aaron
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