From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Stefan Monnier Newsgroups: gmane.emacs.help Subject: Re: Why is Elisp slow? Date: Tue, 09 Oct 2018 08:27:26 -0400 Message-ID: References: <638fb7dc-6fc5-4645-8793-97a00038a3a8@googlegroups.com> <8hxojvzzzzzz.m4h.xxuns.g6.gal@portable.galex-713.eu> <20181006192457.GB7368@tuxteam.de> <86lg79yl54.fsf@zoho.com> <86d0slrb4h.fsf@zoho.com> <86pnwkpltx.fsf@zoho.com> <8636tgphps.fsf@zoho.com> <86o9c4np6q.fsf_-_@zoho.com> <87efd0dmg8.fsf@portable.galex-713.eu> NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Trace: blaine.gmane.org 1539087977 5868 195.159.176.226 (9 Oct 2018 12:26:17 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Tue, 9 Oct 2018 12:26:17 +0000 (UTC) User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux) To: help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Tue Oct 09 14:26:13 2018 Return-path: Envelope-to: geh-help-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1g9r5X-0001Mj-1O for geh-help-gnu-emacs@m.gmane.org; Tue, 09 Oct 2018 14:26:11 +0200 Original-Received: from localhost ([::1]:51208 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1g9r7d-0003Vy-KD for geh-help-gnu-emacs@m.gmane.org; Tue, 09 Oct 2018 08:28:21 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:36514) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1g9r6w-0003UJ-L3 for help-gnu-emacs@gnu.org; Tue, 09 Oct 2018 08:27:39 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1g9r6t-0005fc-CY for help-gnu-emacs@gnu.org; Tue, 09 Oct 2018 08:27:38 -0400 Original-Received: from [195.159.176.226] (port=41604 helo=blaine.gmane.org) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1g9r6t-0005dG-37 for help-gnu-emacs@gnu.org; Tue, 09 Oct 2018 08:27:35 -0400 Original-Received: from list by blaine.gmane.org with local (Exim 4.84_2) (envelope-from ) id 1g9r4k-0000GA-Ei for help-gnu-emacs@gnu.org; Tue, 09 Oct 2018 14:25:22 +0200 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 16 Original-X-Complaints-To: usenet@blaine.gmane.org Cancel-Lock: sha1:y1f9SU/E5aJbzMhVEiN5AWdkmS8= X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 195.159.176.226 X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Original-Sender: "help-gnu-emacs" Xref: news.gmane.org gmane.emacs.help:118229 Archived-At: > elisp is mostly interpreted (contrarily to C which is always compiled to ^^^ almost > native code, so directly executed by the CPU) and very very dynamic > afaik, not that much optimized at byte-compilation afaiu from what I > observed, and I guess not that much optimized from the VM point of view… Emacs's implementation of Elisp is fairly naive and not carefully optimized. As a result it's not blazing fast. This said, on the rare occasions Elisp was compared to other systems it didn't seem nearly as slow as I thought. E.g. I wouldn't be surprised to hear that it's about as fast as Python (not talking about things like PyPy, tho). Stefan