Performing the following (note the range of 10,000):

`importmulti '[{"desc": "sh(wpkh([aeee1e6a/49h/1h/0h]tpubDC5bVdaveQYxGFztMShFAjU637kKjrs9FD8ne1oHR7z8tLeQJExsaxWRVeSpcCcYMdp5ecf2LQhuVaeYFZ7YEpvWTJr4nDGUJrmuvLuTSsp/1/*))", "keypool": true, "timestamp": "now", "watchonly": true, "internal": true, "range": {"end": 1000}}]' '{"rescan": false}'`

takes many minutes. @achow101 reports a similar import taking 6 minutes on his machine.
ssMB >> merkleBlock;
    
    std::vector<uint256> vMatch;
    std::vector<unsigned int> vIndex;
    unsigned int txnIndex = 0;
    if (merkleBlock.txn.ExtractMatches(vMatch, vIndex) == merkleBlock.header.hashMerkleRoot) {
        auto locked_chain = pwallet->chain().lock();
        if (locked_chain->getBlockHeight(merkleBlock.header.GetHash()) == nullopt) {
            throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Block not found in chain");
        }
        std::vector<uint256>::const_iterator it;
        if ((it = std::find(vMatch.begin(), vMatch.end(), hashTx))==vMatch.end()) {
            throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Transaction given doesn't exist in proof");
        }
        txnIndex = vIndex[it - vMatch.begin()];
    }
    else {
        throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Something wrong with merkleblock");
    }
    wtx.nIndex = txnIndex;
    wtx.hashBlock = merkleBlock.header.GetHash();
    auto locked_chain = pwallet->chain().lock();
    LOCK(pwallet->cs_wallet);
    if (pwallet->IsMine(*wtx.tx)) {
        pwallet->AddToWallet(wtx, false);
        return NullUniValue;
    }
    throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "No addresses in wallet correspond to included transaction");
}
UniValue removeprunedfunds(const JSONRPCRequest& request)