Preloading bitcoin core blocks data

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Hi, I'm setting up a bitcoin node using Bitcoin Core on UmbrelI noticed that the syncing is relatively slow. I investigated a bit and found that the bottleneck is that my node often connects to peers that stall block transfers.

My goal here is to speed up the initial syncing process.

I went to the app data directory data/bitcoin/blocks and found a list of files namedblk00000.dat

blk00001.dat  
blk00002.dat  
blk00003.dat  
...  
rev00000.dat  
rev00001.dat  
rev00002.dat  
rev00003.dat  
...

Is it possible to pre-download block data, extract data, and bootstrap the node with it? If so, where can I download it?

Thanks!