Magento 2's full page cache is one of its strongest performance features — when it works. But every week, we see stores where a simple product save triggers a 30-second Varnish flush and subsequent cache stampede. The culprit is almost never Varnish itself.
Source: [Dev.to](https://dev.to/magevanta/magento-2-cache-tag-strategy-prevent-cache-invalidation-storms-3ol4)