Magento 2.4 Category Cache - magento2.4

Can someone explain the caching for categories.
I make SEO changes in the admin to a category or edit page builder content and press save. No changes show on the frontend, so I clear the Magento 2 cache, no changes. Check back 2-3 minutes later and the changes are now showing on the frontend.
Why is there a delay and is there something else doing some processing not just the Magento 2 cache?

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Product Page not updating in Magento 1.9

I've tried everything I can find on the web about Magento 1.9 and refreshing a product page. I've updated the price and the old price is still displayed.
Things I've tried:
- Hard refresh in browser
- Different browser
- Private browsing
I've refreshed the cache for all caches in the page "Cache Storage Management"
The Magento Cache has been flushed
The Cache Storage has been flushed
All indexes have been reindexed
Disable and re-enable combining CSS and JavaScript files.
I'm on the correct product page. Both the URL and the product ID match the page and the product in magento.
I've deleted all files in the "/var/cache" folder.
I've updated the product description by adding a period and other small stuff.
Yet the page stays the same. Every time I refresh it displays the old data.
What else can I try?
You can try to fix it by do the re-indexing of "Product Prices". like below:
php shell/indexer.php --reindex catalog_product_price
The web host implemented server side caching. Disabling their caching was the solution that worked.

Magento 1.9.1 strange behavior with layered navigation

I am having this strange problem with a magento installation 1.9.1.
After template changed and nothing else my previous extension for layered navigation manadev layered navigation has a strange behavior with ajax loading.
When I hit a category and choose a filter with few products everything works fine.
But I have some filters with more than 1000 products each.I have magento default loading up 30 products.
When you hit one of these filters it tries to load all the products in same ignoring the setting of 30 products.
So when I hit a filter or category with 2000 products I get a page with 2000 products loading one by.
This kills my server and of course isn't working.
I tried everything I know but still all products from database are pulled together instead of getting them by portions (items per page).
When I turn off ajax everything is working fine. I use Varnish,Apache,APC,Memcached. I see no error at all except in frontend layered navigation page ESI processing not enabled but this is because we have caches off for development.
So for some reason ajax magento default number of products.
Any help please?

Magento - All product categories are empty (frontend)

All my products have vanished from my website (front end). They are all in the back end and I can open them and make changes etc. But they aren't appearing when I click on one of the tabs for a certain category.
The page comes up fine with the category details and the category feature image. But no products are showing.
I am using the JoomlArt theme called JM Wall, I have just updated to the latest version 1.9.0.1 and I've tried the following; flush magento cache, flush cache storage, flush catalog images cache, flush javascript/css cache, also tried re-indexing all the data on the index management page.
Any suggestions on how to fix?
Magento ver. 1.9.0.1

How to Clear recently viewed items (frontend user function) - Magento

Currently in the Magento cart there is a link button that clears the cart of its contents.
In a similar manner, I need to have a link button in the "Recently Viewed" panel that clears a user's recently viewed products list. I'm suspecting this needs to occur by somehow clearing the user's visitation cache - I'm unsure how Magento records and stores visited products.
Does anyone know of a way to do this in Magento?
If anyone has any suggestions on how I may do this, I'd be grateful.
(note this is not a question on how to clear the overall cache in the Magento admin)
Recently viewed products data are stored in report_viewed_product_index table.
you can delete these records based on customer_id/visitor_id

Product moved from Cat to Sub-Cat not showing up on site search

In Admin I created new subcats for my CyberPower category. When I search for BH1500 on our site for the product I get the whoops page. If I go step by step through our site to get to the product it works just fine. Why is the URL missing, or nor showing the link properly?
http://www.unipower.com/products/ups/cyberpower/bh-series.html, is what shows up.
However this
http://www.unipower.com/products/ups/cyberpower/bh-series/BH1500.html
should be the right link.
New to Magento, help me if you can!!
All you should need to do is run a reindex and flush your cache! Basically, your catalog URL rewrites are incorrect or out of date.
System > Index Management - Best to select all elements, choose the Reindex Data action and click the Submit button.
System > Cache Management - Flush Magento Cache

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