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getrawmempool returns only TXID (verbose off), what I'm doing is calling getrawtransaction for each transaction ID to get a transaction hex.
Bitcoin core doesn't support batch requests and each RPC call takes 0.06 sec, for ~ 5000 transactions, it takes 5 min which is so expensive. can I get mempool transactions as hex instantly?
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Bitcoin core doesn't support batch requests
Yes it does. Bitcoin Core uses the follows the JSON-RPC Specification for batching requests. Just use that with a custom client of your choice to interact with the RPC server to get that information. python-bitcoinrpc makes this easy to do.
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Are you sure you need Bitcoin Core and RPC calls for this task?
May be you need some tool for sniffing bitcoin network for all transactions. Have a look to this: https://github.com/sebicas/bitcoin-sniffer
This tool is very old. I am not sure that it works today. Take the main idea.
Another solution is implementing your own RPC-command. Something like "dumpwholemempool". I think it is not too difficult.
