On the contrary, compressed blocks are smaller to transmit over the network, so it's faster. The block is compressed by the block producing node (witness) and it takes a very tiny fraction of CPU processing. It's well explained in paragraphs 2-3 of this post.
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got it, its an efficiency update to handle more traffic :) Was a long day and read it super fast :D
For whatever reason, I thought about compressing old blocks.