QNAP / Slow host name resolution

And this is the content of /etc/pihole/setupVars.conf

QUERY_LOGGING=true                                                                                                                                                                                                                                                                                                                                                                       
INSTALL_WEB_SERVER=true                                                                                                                                                                                                                                                                                                                                                                  
INSTALL_WEB_INTERFACE=true                                                                                                                                                                                                                                                                                                                                                               
LIGHTTPD_ENABLED=true                                                                                                                                                                                                                                                                                                                                                                    
IPV4_ADDRESS=192.168.1.100                                                                                                                                                                                                                                                                                                                                                               
IPV6_ADDRESS=                                                                                                                                                                                                                                                                                                                                                                            
WEBPASSWORD=0000                                                                                                                                                                                                                                                                                                             
PIHOLE_INTERFACE=eth0                                                                                                                                                                                                                                                                                                                                                                    
BLOCKING_ENABLED=true                                                                                                                                                                                                                                                                                                                                                                    
DNSMASQ_LISTENING=single                                                                                                                                                                                                                                                                                                                                                                 
PIHOLE_DNS_1=8.8.8.8                                                                                                                                                                                                                                                                                                                                                                     
PIHOLE_DNS_2=8.8.4.4                                                                                                                                                                                                                                                                                                                                                                     
PIHOLE_DNS_3=1.1.1.1                                                                                                                                                                                                                                                                                                                                                                     
PIHOLE_DNS_4=1.0.0.1                                                                                                                                                                                                                                                                                                                                                                     
DNS_FQDN_REQUIRED=false                                                                                                                                                                                                                                                                                                                                                                  
DNS_BOGUS_PRIV=false                                                                                                                                                                                                                                                                                                                                                                     
DNSSEC=true                                                                                                                                                                                                                                                                                                                                                                              
CONDITIONAL_FORWARDING=true                                                                                                                                                                                                                                                                                                                                                              
CONDITIONAL_FORWARDING_IP=192.168.1.1                                                                                                                                                                                                                                                                                                                                                    
CONDITIONAL_FORWARDING_DOMAIN=home                                                                                                                                                                                                                                                                                                                                                       
CONDITIONAL_FORWARDING_REVERSE=1.168.192.in-addr.arpa