If I take something like 30 pictures with my own camera and load them to my wordpress.com blog, will it slow the loading time?
It depends a bit on your intended use of the images, and how well you optimise them before uploading.
If you’re planning to display them all on the same page, it would be better to use a thumbnail gallery of small images, where visitors could click to view a full-sized version if they wished. Thirty large images on a page would be slow to load and use a lot of bandwidth for folk who might not want to view them all.
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Adding anything to a page will affect the load time to some extent. Whether it’s a 20 byte CSS rule that adds .00000032ms, a 5K jpeg that adds .0046ms, or a massive mpeg that adds 1.23s, everything adds up.
As @TechnoBear posted, images should be optimized so that they have the smallest weight possible without sacrificing their quality too much. And I agree, if there are a lot of images in a single page, having lower weight thumbnails is a good idea.
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A lot of “LazyLoad” JavaScript research has and is still is being perfected. WordPress has quite a few plugins which claim to reduce the “above the fold” rendering and to Lazyload the remaining page.
An alternative to displaying the full image is to create thumbnail links to a larger image.
Google are now supporting the Open Source AmpProject and supply a Free CDN caching service which is beneficial to page loading times.
Although the original idea of the AmpProject was to decrease slow loading mobile pages, the same techniques dramatically improve desktop rendering as can be seen by this Example which displays many very large images but still has an impressive “above the fold” page rendering time.
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