From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.bugs Subject: bug#26051: 25.1; overlays may make emacs very slow Date: Fri, 10 Mar 2017 19:02:59 +0200 Message-ID: <83pohpdpz0.fsf@gnu.org> References: <87varh3xql.fsf@gmail.com> Reply-To: Eli Zaretskii NNTP-Posting-Host: blaine.gmane.org X-Trace: blaine.gmane.org 1489165486 4577 195.159.176.226 (10 Mar 2017 17:04:46 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Fri, 10 Mar 2017 17:04:46 +0000 (UTC) Cc: 26051@debbugs.gnu.org To: ynyaaa@gmail.com Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Fri Mar 10 18:04:42 2017 Return-path: Envelope-to: geb-bug-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 1cmNy4-0000Yh-PB for geb-bug-gnu-emacs@m.gmane.org; Fri, 10 Mar 2017 18:04:40 +0100 Original-Received: from localhost ([::1]:40067 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cmNyA-0003go-Rl for geb-bug-gnu-emacs@m.gmane.org; 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Fri, 10 Mar 2017 12:03:18 -0500 In-reply-to: <87varh3xql.fsf@gmail.com> (ynyaaa@gmail.com) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 208.118.235.43 X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Original-Sender: "bug-gnu-emacs" Xref: news.gmane.org gmane.emacs.bugs:130446 Archived-At: > From: ynyaaa@gmail.com > Date: Sat, 11 Mar 2017 01:25:22 +0900 > > > Evaluating the form below in the *scratch* buffer, > it takes a few seconds to show the result. > > (let ((n 65536)) > (save-excursion (dotimes (i n) (insert (format "%d\n" i)))) > (dotimes (i n) (make-overlay (point) (progn (forward-line) (point)))) > (message "Done.")) > > If I evaluate the form as below, it takes about 30 seconds. > (1) switch to a newly created buffer > (2) insert the code into the buffer > (3) insert 2 line breaks after the last closing parenthesis > (4) type C-x C-e > > If I evaluate the form as below, it takes about 10 minutes. > (1) switch to a newly created buffer > (2) type M-: and input the code > > In each case, the message "Done." is displayed in a few seconds. > But it takes a long time to display the buffer contents. The overlays is not the main problem here, the main problem is that your buffer is made of digits, which are neutral characters for the bidirectional display, so it needs to work much harder. Compare with this: (let ((n 65536)) (save-excursion (dotimes (i n) (insert (format "a%d\n" i)))) (dotimes (i n) (make-overlay (point) (progn (forward-line) (point)))) (message "Done.")) I see no bugs here, just known issues/limitations of the current display engine.