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.
reservekey.KeepKey();
            
            
            AddToWallet(wtxNew);
            
            for (const CTxIn& txin : wtxNew.tx->vin)
            {
                CWalletTx &coin = mapWallet.at(txin.prevout.hash);
                coin.BindWallet(this);
                NotifyTransactionChanged(this, coin.GetHash(), CT_UPDATED);
            }
        }
        
        
        CWalletTx& wtx = mapWallet.at(wtxNew.GetHash());
        if (fBroadcastTransactions)
        {
            
            if (!wtx.AcceptToMemoryPool(*locked_chain, state)) {
                WalletLogPrintf("CommitTransaction(): Transaction cannot be broadcast immediately, %s\n", FormatStateMessage(state));
                
            } else {
                wtx.RelayWalletTransaction(*locked_chain);
            }
        }
    }
    return true;
}
DBErrors CWallet::LoadWallet(bool& fFirstRunRet)