Own OSM map tile server seems not to render or is very slow

I have a problem with my own tile server. I tested it with https://download.geofabrik.de/europe/germany/bayern-latest.osm.pbf and everything works fine. At the beginning it took about 200 seconds to render the first tile but then it worked quite good. After this I load up another set https://download.geofabrik.de/europe/germany/saarland-latest.osm.pbf with –create and it worked still. Then I wanted to try the same with a bigger set (Germany, Switzerland, Austria) http://download.geofabrik.de/europe/dach-latest.osm.pbf. It took about 12 hours to process the osm2pgsql. Now I started the tile server again and it seems not to work. Other possibility is that it is very slow. Here is the grep rendered:

Mar 24 10:36:47 h2929534 renderd[8445]: DEBUG: Loading font: /usr/share/fonts/truetype/unifont/unifont_csur.ttf
Mar 24 10:36:47 h2929534 renderd[8445]: DEBUG: Loading font: /usr/share/fonts/truetype/unifont/unifont.ttf
Mar 24 10:36:47 h2929534 renderd[8445]: Loading parameterization function for
Mar 24 10:36:47 h2929534 renderd[8445]: Starting stats thread
Mar 24 10:36:47 h2929534 renderd[8445]: Loading parameterization function for
Mar 24 10:36:47 h2929534 renderd[8445]: message repeated 5 times: [ Loading parameterization function for]
Mar 24 10:36:54 h2929534 renderd[8445]: DEBUG: Got incoming connection, fd 8, number 1
Mar 24 10:36:54 h2929534 renderd[8445]: DEBUG: Got incoming request with protocol version 2
Mar 24 10:36:54 h2929534 renderd[8445]: DEBUG: Got command RenderPrio fd(8) xml(ajt), z(19), x(247506), y(167636), mime(image/png), options()
Mar 24 10:36:56 h2929534 renderd[8445]: Using web mercator projection settings
Mar 24 10:36:56 h2929534 renderd[8445]: DEBUG: START TILE ajt 19 247504-247511 167632-167639, new metatile
Mar 24 10:36:56 h2929534 renderd[8445]: Rendering projected coordinates 19 247504 167632 -> -1119038.094096|7223604.921066 -1118426.597869|7224216.417292 to a 8 x 8 tile
Mar 24 10:36:57 h2929534 renderd[8445]: Using web mercator projection settings
Mar 24 10:36:57 h2929534 renderd[8445]: message repeated 5 times: [ Using web mercator projection settings]
Mar 24 10:37:24 h2929534 renderd[8445]: DEBUG: Connection 0, fd 8 closed, now 0 left
Mar 24 10:37:45 h2929534 renderd[8445]: DEBUG: Got incoming connection, fd 7, number 1
Mar 24 10:37:45 h2929534 renderd[8445]: DEBUG: Got incoming request with protocol version 2
Mar 24 10:37:45 h2929534 renderd[8445]: DEBUG: Got command RenderPrio fd(7) xml(ajt), z(19), x(247506), y(167636), mime(image/png), options()
Mar 24 10:38:15 h2929534 renderd[8445]: DEBUG: Connection 0, fd 7 closed, now 0 left
Mar 24 10:39:21 h2929534 renderd[8445]: DEBUG: Got incoming connection, fd 7, number 1
Mar 24 10:39:21 h2929534 renderd[8445]: DEBUG: Got incoming request with protocol version 2
Mar 24 10:39:21 h2929534 renderd[8445]: DEBUG: Got command RenderPrio fd(7) xml(ajt), z(19), x(247506), y(167636), mime(image/png), options()
Mar 24 10:39:51 h2929534 renderd[8445]: DEBUG: Connection 0, fd 7 closed, now 0 left
Mar 24 10:43:44 h2929534 renderd[8445]: DEBUG: Got incoming connection, fd 7, number 1
Mar 24 10:43:44 h2929534 renderd[8445]: DEBUG: Got incoming request with protocol version 2
Mar 24 10:43:44 h2929534 renderd[8445]: DEBUG: Got command RenderPrio fd(7) xml(ajt), z(19), x(247506), y(167636), mime(image/png), options()
Mar 24 10:44:14 h2929534 renderd[8445]: DEBUG: Connection 0, fd 7 closed, now 0 left
Mar 24 10:59:42 h2929534 renderd[8445]: DEBUG: Got incoming connection, fd 7, number 1
Mar 24 10:59:42 h2929534 renderd[8445]: DEBUG: Got incoming request with protocol version 2
Mar 24 10:59:42 h2929534 renderd[8445]: DEBUG: Got command RenderPrio fd(7) xml(ajt), z(19), x(247506), y(167636), mime(image/png), options()
Mar 24 11:00:12 h2929534 renderd[8445]: DEBUG: Connection 0, fd 7 closed, now 0 left
Mar 24 11:00:56 h2929534 renderd[8445]: DEBUG: Got incoming connection, fd 7, number 1
Mar 24 11:00:57 h2929534 renderd[8445]: DEBUG: Got incoming request with protocol version 2
Mar 24 11:00:57 h2929534 renderd[8445]: DEBUG: Got command RenderPrio fd(7) xml(ajt), z(19), x(247506), y(167636), mime(image/png), options()
Mar 24 11:01:26 h2929534 renderd[8445]: DEBUG: Connection 0, fd 7 closed, now 0 left
Mar 24 11:11:53 h2929534 renderd[8445]: DEBUG: Got incoming connection, fd 7, number 1
Mar 24 11:11:53 h2929534 renderd[8445]: DEBUG: Got incoming request with protocol version 2
Mar 24 11:11:53 h2929534 renderd[8445]: DEBUG: Got command RenderPrio fd(7) xml(ajt), z(19), x(247506), y(167636), mime(image/png), options()
Mar 24 11:12:23 h2929534 renderd[8445]: DEBUG: Connection 0, fd 7 closed, now 0 left
Mar 24 11:13:48 h2929534 renderd[8445]: DEBUG: Got incoming connection, fd 7, number 1
Mar 24 11:13:48 h2929534 renderd[8445]: DEBUG: Got incoming request with protocol version 2
Mar 24 11:13:48 h2929534 renderd[8445]: DEBUG: Got command RenderPrio fd(7) xml(ajt), z(19), x(247506), y(167636), mime(image/png), options()
Mar 24 11:14:18 h2929534 renderd[8445]: DEBUG: Connection 0, fd 7 closed, now 0 left
Mar 24 11:16:09 h2929534 renderd[8445]: DEBUG: Got incoming connection, fd 7, number 1
Mar 24 11:16:09 h2929534 renderd[8445]: DEBUG: Got incoming request with protocol version 2
Mar 24 11:16:09 h2929534 renderd[8445]: DEBUG: Got command RenderPrio fd(7) xml(ajt), z(19), x(247506), y(167636), mime(image/png), options()
Mar 24 11:16:39 h2929534 renderd[8445]: DEBUG: Connection 0, fd 7 closed, now 0 left
Mar 24 11:21:53 h2929534 renderd[8445]: DEBUG: Got incoming connection, fd 7, number 1
Mar 24 11:21:53 h2929534 renderd[8445]: DEBUG: Got incoming request with protocol version 2
Mar 24 11:21:53 h2929534 renderd[8445]: DEBUG: Got command RenderPrio fd(7) xml(ajt), z(19), x(247506), y(167636), mime(image/png), options()
Mar 24 11:22:23 h2929534 renderd[8445]: DEBUG: Connection 0, fd 7 closed, now 0 left

I tried to render the /hot/19/247506/167636.png

System:
Ubuntu 18.04 LTS on V-Server
32 GB ram
800 GB SSD 8 core cpu