gdrive reads: 30sec delay before first chunk (not write!)

rclone mount gdr1:/ ~/mnt/gtest -vv > rclone_delay.log
2021/03/06 22:03:33 DEBUG : rclone: Version "v1.54.0" starting with parameters ["rclone" "mount" "gdr1:/" "/home/maak/mnt/gtest" "-vv"]
2021/03/06 22:03:33 DEBUG : Creating backend with remote "gdr1:/"
2021/03/06 22:03:33 DEBUG : Using config file from "/home/maak/.config/rclone/rclone.conf"
2021/03/06 22:03:33 DEBUG : fs cache: renaming cache item "gdr1:/" to be canonical "gdr1:"
2021/03/06 22:03:33 DEBUG : Google drive root '': Mounting on "/home/maak/mnt/gtest"
2021/03/06 22:03:33 DEBUG : : Root:
2021/03/06 22:03:33 DEBUG : : >Root: node=/, err=<nil>
2021/03/06 22:03:49 DEBUG : /: Lookup: name="100mb.test"
2021/03/06 22:03:50 DEBUG : /: >Lookup: node=100mb.test, err=<nil>
2021/03/06 22:03:50 DEBUG : 100mb.test: Attr:
2021/03/06 22:03:50 DEBUG : 100mb.test: >Attr: a=valid=1s ino=0 size=104857600 mode=-rw-r--r--, err=<nil>
2021/03/06 22:03:50 DEBUG : 100mb.test: Open: flags=OpenReadOnly
2021/03/06 22:03:50 DEBUG : 100mb.test: Open: flags=O_RDONLY
2021/03/06 22:03:50 DEBUG : 100mb.test: >Open: fd=100mb.test (r), err=<nil>
2021/03/06 22:03:50 DEBUG : 100mb.test: >Open: fh=&{100mb.test (r)}, err=<nil>
2021/03/06 22:03:50 DEBUG : &{100mb.test (r)}: Read: len=131072, offset=0
2021/03/06 22:03:50 DEBUG : 100mb.test: ChunkedReader.openRange at 0 length 134217728
2021/03/06 22:04:20 DEBUG : 100mb.test: ChunkedReader.Read at 0 length 4096 chunkOffset 0 chunkSize 134217728
2021/03/06 22:04:20 DEBUG : 100mb.test: ChunkedReader.Read at 4096 length 8192 chunkOffset 0 chunkSize 134217728
2021/03/06 22:04:20 DEBUG : 100mb.test: ChunkedReader.Read at 12288 length 16384 chunkOffset 0 chunkSize 134217728
2021/03/06 22:04:20 DEBUG : 100mb.test: ChunkedReader.Read at 28672 length 32768 chunkOffset 0 chunkSize 134217728
2021/03/06 22:04:20 DEBUG : 100mb.test: ChunkedReader.Read at 61440 length 65536 chunkOffset 0 chunkSize 134217728
2021/03/06 22:04:20 DEBUG : 100mb.test: ChunkedReader.Read at 126976 length 131072 chunkOffset 0 chunkSize 134217728
2021/03/06 22:04:20 DEBUG : 100mb.test: ChunkedReader.Read at 258048 length 262144 chunkOffset 0 chunkSize 134217728
2021/03/06 22:04:20 DEBUG : &{100mb.test (r)}: >Read: read=131072, err=<nil>
2021/03/06 22:04:20 DEBUG : &{100mb.test (r)}: Read: len=131072, offset=131072
2021/03/06 22:04:20 DEBUG : 100mb.test: ChunkedReader.Read at 520192 length 524288 chunkOffset 0 chunkSize 134217728
2021/03/06 22:04:20 DEBUG : &{100mb.test (r)}: >Read: read=131072, err=<nil>
2021/03/06 22:04:20 DEBUG : &{100mb.test (r)}: Read: len=131072, offset=262144
2021/03/06 22:04:20 DEBUG : &{100mb.test (r)}: >Read: read=131072, err=<nil>
...