So ...

We are going to use a handy plugin called Envira Photo Gallery.

Here it is:

https://wordpress.org/plugins/envira-gallery-lite/

In my opinion, is definitely the best gallery and portfolio plugin.

It's a drag & drop plugin that’s both easy, fast and powerful. And it's is highly optimized for web and server performance. To put it simply, it's the perfect tool for the job ... Even the free Lite version will allow you to easily create beautiful galleries and portfolios that look stunning on all devices and screen sizes.

Here's the full feature list (pro features included):

• Guttenberg Blocks
• Drag & Drop Photo Gallery Builder
• 100% responsive & mobile friendly
• beautiful WordPress templates for customization
• albums - easily organize your photo galleries, choose cover photos, and more
• social sharing - share your photos on Facebook, Twitter, Pinterest, and Google+
• video galleries - you can add YouTube, Vimeo, Wistia, and other videos in your video gallery
• watermarking - protect your images from theft with watermarking
• slideshow - add beautiful slideshow with autoplay, manual controls, and more
• deeplinking - make your gallery and images SEO friendly and easily link to individual images with deeplinking
• pagination - split your large galleries into multiple pages to improve page speed, user experience, and pageviews
• WooCommerce Integration – instantly display and sell your photos with the most popular eCommerce software on the web
• image tags – organize your WordPress photos with tags for easy search and display that also filtrable
• password protection – prevent unauthorized access to your WordPress galleries
• standalone galleries – create independent galleries that are not tied to your posts or pages
• EXIF Meta Data – display your EXIF data including camera model, aperture, shutter speed, and more
• Pinterest – add the Pinterest Pin It button to improve your reach
• Instagram – import Instagram images
• full-screen display – take advantage of the native fullscreen and Lightbox display
• dynamic galleries – easily create galleries on the fly from various different sources
• gallery defaults – speed up the creation process by saving your default settings
• CSS styles – customize your portfolio by adding custom CSS and styles
• Adobe Lightroom to WordPress – you can automatically create and sync photo galleries from your Adobe Lightroom Collections
• Zip importer – nobody likes uploading images individually; now you can build a gallery from a .zip file
• Dropbox importer – you can easily import photos from your Dropbox account

Impressive, isn't it? And it's a relatively small plugin (900 KB) ... But let's see the usual speed tests ...

Here are my results before installing the plugin ...

... and the result after installing and activating the plugin:

As you can see, it's almost invisible ... No more comments needed ...

Now let's see how it works ...