Nuget V2 group slow performance

The search on nuget group seems its consistently slow, taking 60 to 80 seconds:

X.X.X.X - - [27/Dec/2018:15:59:56 +0100] "GET /repository/nuget-public/Search()?=IsLatestVersion&searchTerm=''&targetFramework=''&includePrerelease=false&=0&=26&semVerLevel=2.0.0 HTTP/1.0" 200 - 104677 68841 "curl/7.29.0"

The same direct call to group member hosted and proxy nuget searches are quick. So the issue is do with going through a group

X.X.X.X - - [28/Dec/2018:08:13:03 +0100] "GET /repository/nuget-releases/Search()?=IsLatestVersion&searchTerm=''&targetFramework=''&includePrerelease=false&=0&=26&semVerLevel=2.0.0 HTTP/1.0" 200 - 94874 54 "curl/7.29.0"

 

X.X.X.X - - [28/Dec/2018:08:13:23 +0100] "GET /repository/nuget-snapshots/Search()?=IsLatestVersion&searchTerm=''&targetFramework=''&includePrerelease=false&=0&=26&semVerLevel=2.0.0 HTTP/1.0" 200 - 114990 79 "curl/7.29.0

X.X.X.X - - [27/Dec/2018:16:00:13 +0100] "GET /repository/nuget-gallery/Search()?=IsLatestVersion&searchTerm=''&targetFramework=''&includePrerelease=false&=0&=26&semVerLevel=2.0.0 HTTP/1.0" 200 - 104760 1679 "curl/7.29.0"