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.
{
    
    CKey seed;                     
    CExtKey masterKey;             
    CExtKey accountKey;            
    CExtKey chainChildKey;         
    CExtKey childKey;              
    
    if (!GetKey(hdChain.seed_id, seed))
        throw std::runtime_error(std::string(__func__) + ": seed not found");
    masterKey.SetSeed(seed.begin(), seed.size());
    
    
    masterKey.Derive(accountKey, BIP32_HARDENED_KEY_LIMIT);
    
    assert(internal ? CanSupportFeature(FEATURE_HD_SPLIT) : true);
    accountKey.Derive(chainChildKey, BIP32_HARDENED_KEY_LIMIT+(internal ? 1 : 0));
    
    do {