Slow loading widget panel since v2.5 upgrade

[drawcard]

Prerequisites

• I have searched for similar issues in both open and closed tickets and cannot find a duplicate.
• The issue still exists against the latest stable version of Elementor.

Description

Since upgrading E + E Pro to 2.5 I have noticed a bit of slowness with the widget panel, it takes about 25-30 seconds for the panel to activate. Elementor itself loads faster though (presumably because some of the loading has been offloaded to this stage). It's more of a nuisance when creating a brand new page, while waiting to drag a new element onto the page.

Steps to reproduce

1. New page & fire up elementor
2. Wait for elementor to load
3. Wait for sidebar widget panel to load

Isolating the problem

• This bug happens with only Elementor plugin active (and Elementor Pro).
• This bug happens with a default WordPress theme active.
• I can reproduce this bug consistently using the steps above.

Environment

System Info

```

== Server Environment ==
Operating System: Linux
Software: Apache/2.4.29
MySQL version: (Ubuntu) v5.7.25
PHP Version: 7.2.11-2+ubuntu18.04.1+deb.sury.org+1
PHP Max Input Vars: 1000
PHP Max Post Size: 100M
GD Installed: Yes
ZIP Installed: Yes
Write Permissions: All right
Elementor Library: Connected

== WordPress Environment ==
Version: 5.1
Site URL:
Home URL:
WP Multisite: No
Max Upload Size: 100 MB
Memory limit: 40M
Permalink Structure: /%year%/%monthnum%/%postname%/
Language: en-AU
Timezone: 0
Debug Mode: Active

== Theme ==
Name: Elementor Hello Theme
Version: 1.1.0
Author: Elementor Team
Child Theme: No

== User ==
Role: administrator
WP Profile lang: en_AU
User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/72.0.3626.119 Safari/537.36

== Active Plugins ==
Elementor
Version: 2.5.1
Author: Elementor.com

Elementor Pro
	Version: 2.4.6
	Author: Elementor.com

Health Check & Troubleshooting
	Version: 1.2.5
	Author: The WordPress.org community

WP Cerber Security, Antispam & Malware Scan
	Version: 8.0
	Author: Gregory

WP Migrate DB Pro
	Version: 1.9.4
	Author: Delicious Brains

WP Migrate DB Pro CLI
	Version: 1.3.5
	Author: Delicious Brains

WP Migrate DB Pro Media Files
	Version: 1.4.13
	Author: Delicious Brains

WP Migrate DB Pro Multisite Tools
	Version: 1.2.5
	Author: Delicious Brains

WP Migrate DB Pro Theme & Plugin Files
	Version: 1.0.5
	Author: Delicious Brains

== Log ==
:
JS: showing 1 of 1JS: 2019-01-31 06:45:14 [error X 1][/wp-content/plugins/elementor/assets/js/editor.min.js?ver=2.4.5:2:6883] Cannot read property 'select2' of undefined

Log: showing 2 of 22019-03-05 01:20:11 [info] Elementor data updater process has been completed. [array (
'plugin' => 'Elementor',
'from' => '2.4.5',
'to' => '2.5.1',
)]
2019-03-05 01:20:11 [info] Elementor data updater process has been completed. [array (
'plugin' => 'Elementor Pro',
'from' => '2.4.0',
'to' => '2.4.6',
)]

</details>

[reardestani]

We had same issue in our GoDaddy and SiteGround servers. We enabled the Gzip via .htaccess (https://monosnap.com/file/9umgCNEWfjJQhfIZih3EWGavRmkza6). It may help you.

Consider that Gzip module was active but it wasn't doing anything by default. After the following codes it loads faster.

<IfModule mod_deflate.c>
AddOutputFilterByType DEFLATE text/plain
AddOutputFilterByType DEFLATE text/html
AddOutputFilterByType DEFLATE text/xml
AddOutputFilterByType DEFLATE text/css
AddOutputFilterByType DEFLATE text/json
AddOutputFilterByType DEFLATE application/xml
AddOutputFilterByType DEFLATE application/xhtml+xml
AddOutputFilterByType DEFLATE application/rss+xml
AddOutputFilterByType DEFLATE application/javascript
AddOutputFilterByType DEFLATE application/x-javascript
AddOutputFilterByType DEFLATE application/json
</IfModule>

[adrianabelei]

I was having problems with low loading speed widget on Elementor and now the website is working perfectly. Thanks for this!