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.
{
    
    
    
    
    
    bool ret = locked_chain.submitToMemoryPool(tx, pwallet->chain().maxTxFee(), state);
    fInMempool |= ret;
    return ret;
}
void CWallet::LearnRelatedScripts(const CPubKey& key, OutputType type)
{
    if (key.IsCompressed() && (type == OutputType::P2SH_SEGWIT || type == OutputType::BECH32)) {
        CTxDestination witdest = WitnessV0KeyHash(key.GetID());
        CScript witprog = GetScriptForDestination(witdest);
        
        assert(IsSolvable(*this, witprog));
        AddCScript(witprog);
    }
}
void CWallet::LearnAllRelatedScripts(const CPubKey& key)
{
    
    LearnRelatedScripts(key, OutputType::P2SH_SEGWIT);
}
std::vector<OutputGroup> CWallet::GroupOutputs(const std::vector<COutput>& outputs, bool single_coin) const {