Opening large XML file is slow (at least much slower than NotepadQQ)

[KAMI911]

 * Xed version (xed --version)
xed - Version 3.2.7
 * Distribution - (Mint 17.2, Arch, Fedora 25, etc...)
NAME="Linux Mint"
VERSION="21 (Vanessa)"
ID=linuxmint
ID_LIKE="ubuntu debian"
PRETTY_NAME="Linux Mint 21"
VERSION_ID="21"
HOME_URL="https://www.linuxmint.com/"
SUPPORT_URL="https://forums.linuxmint.com/"
BUG_REPORT_URL="http://linuxmint-troubleshooting-guide.readthedocs.io/en/latest/"
PRIVACY_POLICY_URL="https://www.linuxmint.com/"
VERSION_CODENAME=vanessa
UBUNTU_CODENAME=jammy

Issue Opening large (12Mb) XML file is slow, much slower than NotepadQQ. Here is an example file to reproduce: http://httpmegosztas.posta.hu/PartnerExtra/Out/StreetNames.xml

Steps to reproduce Download the file Open the file in Xed That is slow

Expected behaviour Open file should be snappy

Other information

System:
  Host: mint Kernel: 5.17.15-051715-generic x86_64 bits: 64
    Desktop: Cinnamon 5.4.12 Distro: Linux Mint 21 Vanessa
Machine:
  Type: Laptop System: Dell product: Latitude E6440 v: 00
    serial: <superuser required>
  Mobo: Dell model: 02P3T1 v: A00 serial: <superuser required> UEFI: Dell
    v: A21 date: 02/01/2018
Battery:
  ID-1: BAT0 charge: 12.0 Wh (16.8%) condition: 71.5/99.9 Wh (71.6%)
CPU:
  Info: quad core model: Intel Core i7-4700MQ bits: 64 type: MT MCP cache:
    L2: 1024 KiB
  Speed (MHz): avg: 3077 min/max: 800/3400 cores: 1: 3237 2: 3381 3: 3074
    4: 2862 5: 2984 6: 3280 7: 2938 8: 2861
Graphics:
  Device-1: Intel 4th Gen Core Processor Integrated Graphics driver: i915
    v: kernel
  Device-2: AMD Sun XT [Radeon HD 8670A/8670M/8690M / R5 M330 M430 Radeon
    520 Mobile]
    driver: amdgpu v: kernel
  Device-3: Microdia Laptop_Integrated_Webcam_HD type: USB driver: uvcvideo
  Display: x11 server: X.Org v: 1.21.1.3 driver: X:
    loaded: amdgpu,ati,modesetting unloaded: fbdev,vesa gpu: i915
    resolution: 1600x900~60Hz
  OpenGL: renderer: Mesa Intel HD Graphics 4600 (HSW GT2)
    v: 4.6 Mesa 22.0.5
Drives:
  Local Storage: total: raw: 2.05 TiB usable: 3.81 TiB used: 1.6 TiB (42.0%)
  ID-1: /dev/sda vendor: Samsung model: SSD 860 EVO 2TB size: 1.82 TiB

[haarp]

Could be related to #174. Basically anything that doesn't have frequent newlines sprinkled throughout it will make gedit, Pluma and xed go haywire with CPU usage, usually requiring it to be killed.

[terr72]

Just came across the same issue with syslogs in the 20-30MB range. It's unbearable slow (15-20s) when the progress bar comes up, just like loading something from a floppy drive back in the day. There must be a really bad implementation in the process, that hogs even modern CPUs for something simply like display text.