no, I doubt that my ISP is blocking anything.
I am also aware that the cache has to be filled first, but the queries sometimes take 2-4 seconds. I also have a pdns recursor in operation and it is nowhere near as slow as this one.
Here is some log.
Apr 30 14:51:40 pdns-recursor[128737]: PowerDNS Recursor 4.8.7 (C) 2001-2022 PowerDNS.COM BV
Apr 30 14:51:40 pdns-recursor[128737]: Using 64-bits mode. Built using gcc 12.2.0.
Apr 30 14:51:40 pdns-recursor[128737]: PowerDNS comes with ABSOLUTELY NO WARRANTY. This is free software, and you are welcome to redistribute it according to the terms of the GPL version 2.
Apr 30 14:51:40 pdns-recursor[128737]: msg="Enabling IPv4 transport for outgoing queries" subsystem="config" level="0" prio="Notice" tid="0" ts="1714481500.457"
Apr 30 14:51:40 pdns-recursor[128737]: msg="Enabling IPv6 transport for outgoing queries" subsystem="config" level="0" prio="Notice" tid="0" ts="1714481500.457"
Apr 30 14:51:40 pdns-recursor[128737]: msg="Setting access control" subsystem="config" level="0" prio="Info" tid="0" ts="1714481500.462" acl="allow-from" addresses="192.168.150.0/24 127.0.0.1/32"
Apr 30 14:51:40 pdns-recursor[128737]: msg="Will not send queries to" subsystem="config" level="0" prio="Notice" tid="0" ts="1714481500.476" addresses="127.0.0.0/8 10.0.0.0/8 100.64.0.0/10 169.254.0.0/16 192.168.0.0/16 172.16.0.0/12 ::1/128 fc00::/7 fe80::/10 0.0.0.0/8 192.0.0.0/24 192.0.2.0/24 198.51.100.0/24 203.0.113.0/24 240.0.0.0/4 ::/96 ::ffff:0:0/96 100::/64 2001:db8::/32 0.0.0.0 ::"
Apr 30 14:51:40 pdns-recursor[128737]: msg="Reading zone forwarding information" subsystem="config" level="0" prio="Notice" tid="0" ts="1714481500.476" file="/run/pdns-recursor/recursor.forward-zones.conf"
Apr 30 14:51:40 pdns-recursor[128737]: msg="Done parsing forwarding instructions from file" subsystem="config" level="0" prio="Notice" tid="0" ts="1714481500.476" count="1" file="/run/pdns-recursor/recursor.forward-zones.conf"
Apr 30 14:51:40 pdns-recursor[128737]: msg="Inserting forward zone based on hosts file" subsystem="config" level="0" prio="Notice" tid="0" ts="1714481500.476" zone="localhost"
Apr 30 14:51:40 pdns-recursor[128737]: msg="Inserting reverse zone based on hosts file" subsystem="config" level="0" prio="Notice" tid="0" ts="1714481500.476" zone="1.0.0.127.in-addr.arpa"
Apr 30 14:51:40 pdns-recursor[128737]: msg="Inserting forward zone based on hosts file" subsystem="config" level="0" prio="Notice" tid="0" ts="1714481500.476" zone="vyos"
Apr 30 14:51:40 pdns-recursor[128737]: msg="Inserting reverse zone based on hosts file" subsystem="config" level="0" prio="Notice" tid="0" ts="1714481500.476" zone="1.1.0.127.in-addr.arpa"
Apr 30 14:51:40 pdns-recursor[128737]: msg="Will not overwrite already loaded zone" subsystem="config" level="0" prio="Warning" tid="0" ts="1714481500.476" zone="localhost"
Apr 30 14:51:40 pdns-recursor[128737]: msg="Inserting forward zone based on hosts file" subsystem="config" level="0" prio="Notice" tid="0" ts="1714481500.476" zone="ip6-localhost"
Apr 30 14:51:40 pdns-recursor[128737]: msg="Inserting forward zone based on hosts file" subsystem="config" level="0" prio="Notice" tid="0" ts="1714481500.476" zone="ip6-loopback"
Apr 30 14:51:40 pdns-recursor[128737]: msg="Inserting reverse zone based on hosts file" subsystem="config" level="0" prio="Notice" tid="0" ts="1714481500.476" zone="1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.ip6.arpa"
Apr 30 14:51:40 pdns-recursor[128737]: msg="Inserting forward zone based on hosts file" subsystem="config" level="0" prio="Notice" tid="0" ts="1714481500.476" zone="ip6-localnet"
Apr 30 14:51:40 pdns-recursor[128737]: msg="Inserting reverse zone based on hosts file" subsystem="config" level="0" prio="Notice" tid="0" ts="1714481500.476" zone="0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.e.f.ip6.arpa"
Apr 30 14:51:40 pdns-recursor[128737]: msg="Inserting forward zone based on hosts file" subsystem="config" level="0" prio="Notice" tid="0" ts="1714481500.476" zone="ip6-mcastprefix"
Apr 30 14:51:40 pdns-recursor[128737]: msg="Inserting reverse zone based on hosts file" subsystem="config" level="0" prio="Notice" tid="0" ts="1714481500.476" zone="0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.f.f.ip6.arpa"
Apr 30 14:51:40 pdns-recursor[128737]: msg="Inserting forward zone based on hosts file" subsystem="config" level="0" prio="Notice" tid="0" ts="1714481500.476" zone="ip6-allnodes"
Apr 30 14:51:40 pdns-recursor[128737]: msg="Inserting reverse zone based on hosts file" subsystem="config" level="0" prio="Notice" tid="0" ts="1714481500.476" zone="1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.2.0.f.f.ip6.arpa"
Apr 30 14:51:40 pdns-recursor[128737]: msg="Inserting forward zone based on hosts file" subsystem="config" level="0" prio="Notice" tid="0" ts="1714481500.476" zone="ip6-allrouters"
Apr 30 14:51:40 pdns-recursor[128737]: msg="Inserting reverse zone based on hosts file" subsystem="config" level="0" prio="Notice" tid="0" ts="1714481500.477" zone="2.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.2.0.f.f.ip6.arpa"
Apr 30 14:51:40 pdns-recursor[128737]: msg="Inserting forward zone based on hosts file" subsystem="config" level="0" prio="Notice" tid="0" ts="1714481500.477" zone="glasfasermodem"
Apr 30 14:51:40 pdns-recursor[128737]: msg="Inserting reverse zone based on hosts file" subsystem="config" level="0" prio="Notice" tid="0" ts="1714481500.477" zone="1.1.10.10.in-addr.arpa"
Apr 30 14:51:40 pdns-recursor[128737]: msg="Aggressive NSEC/NSEC3 caching is enabled but DNSSEC validation is not set to 'validate', 'log-fail' or 'process', ignoring" subsystem="config" level="0" prio="Warning" tid="0" ts="1714481500.477"
Apr 30 14:51:40 pdns-recursor[128737]: msg="Listening for queries" subsystem="config" level="0" prio="Info" tid="0" ts="1714481500.477" address="192.168.150.1" proto="UDP"
Apr 30 14:51:40 pdns-recursor[128737]: msg="Listening for queries" subsystem="config" level="0" prio="Info" tid="0" ts="1714481500.477" address="127.0.0.1" proto="UDP"
Apr 30 14:51:40 pdns-recursor[128737]: msg="Enabled TCP data-ready filter for (slight) DoS protection" subsystem="config" level="0" prio="Info" tid="0" ts="1714481500.477"
Apr 30 14:51:40 pdns-recursor[128737]: msg="Listening for queries" subsystem="config" level="0" prio="Info" tid="0" ts="1714481500.477" address="192.168.150.1" protocol="TCP"
Apr 30 14:51:40 pdns-recursor[128737]: msg="Listening for queries" subsystem="config" level="0" prio="Info" tid="0" ts="1714481500.477" address="127.0.0.1" protocol="TCP"
Apr 30 14:51:40 pdns-recursor[128737]: msg="Operating with single distributor/worker thread" subsystem="config" level="0" prio="Notice" tid="0" ts="1714481500.478"
Apr 30 14:51:40 pdns-recursor[128737]: msg="Enabled multiplexer" subsystem="runtime" level="0" prio="Info" tid="0" ts="1714481500.479" name="epoll"
Apr 30 14:51:40 systemd[1]: Started pdns-recursor.service - PowerDNS Recursor.
Apr 30 14:51:56 pdns-recursor[128737]: msg="Not validating response for security status update, this is a non-release version" subsystem="housekeeping" level="0" prio="Warning" tid="0" ts="1714481516.469" query="recursor-4.8.7-1.Debian.security-status.secpoll.powerdns.com" version="4.8.7-1.Debian"
Apr 30 14:52:02 pdns-recursor[128737]: msg="Sending SERVFAIL during resolve" error="Too much time waiting for ns-824.awsdns-39.net|A, timeouts: 5, throttles: 0, queries: 11, 7890msec" subsystem="syncres" level="0" prio="Notice" tid="1" ts="1714481522.065" ecs="" mtid="14" proto="udp" qname="mask.apple-dns.net" qtype="A" remote="192.168.150.25:62083"
Apr 30 14:52:09 pdns-recursor[128737]: msg="Sending SERVFAIL during resolve" error="Too much time waiting for ns-844.awsdns-41.net|A, timeouts: 5, throttles: 0, queries: 19, 8421msec" subsystem="syncres" level="0" prio="Notice" tid="1" ts="1714481529.491" ecs="" mtid="21" proto="udp" qname="logfiles.zoom.us" qtype="A" remote="192.168.150.44:53154"
Apr 30 14:52:10 pdns-recursor[128737]: msg="Sending SERVFAIL during resolve" error="Too much time waiting for ns-1286.awsdns-32.org|A, timeouts: 5, throttles: 0, queries: 17, 8434msec" subsystem="syncres" level="0" prio="Notice" tid="1" ts="1714481530.551" ecs="" mtid="22" proto="udp" qname="logfiles.zoom.us" qtype="A" remote="192.168.150.44:53154"
Apr 30 14:52:27 pdns-recursor[128737]: msg="Sending SERVFAIL during resolve" error="Too much time waiting for ns3.websupport.eu|A, timeouts: 4, throttles: 0, queries: 8, 7038msec" subsystem="syncres" level="0" prio="Notice" tid="1" ts="1714481547.368" ecs="" mtid="44" proto="udp" qname="1.0.0.127.bip.virusfree.cz" qtype="A" remote="192.168.150.2:42069"
Apr 30 14:52:43 pdns-recursor[128737]: msg="Sending SERVFAIL during resolve" error="Too much time waiting for lb._dns-sd._udp.0.129.37.10.in-addr.arpa|PTR, timeouts: 5, throttles: 0, queries: 11, 8270msec" subsystem="syncres" level="0" prio="Notice" tid="1" ts="1714481563.917" ecs="" mtid="57" proto="udp" qname="lb._dns-sd._udp.0.129.37.10.in-addr.arpa" qtype="PTR" remote="192.168.150.44:60907"
Apr 30 14:53:30 pdns-recursor[128737]: msg="Sending SERVFAIL during resolve" error="Too much time waiting for 1.0.0.127.ix.dnsbl.manitu.net|A, timeouts: 4, throttles: 0, queries: 8, 7027msec" subsystem="syncres" level="0" prio="Notice" tid="1" ts="1714481610.322" ecs="" mtid="122" proto="udp" qname="1.0.0.127.ix.dnsbl.manitu.net" qtype="A" remote="192.168.150.2:50027"