I am uploading a test backup to pcloud and since I had my Windows Task Manager open, I noticed that noticed that sometimes the upload speed is around 3 Mbit/s and sometimes it’s around 7 Mbit/s:
The screenshot shows the point where it just changed from 3 to 7 (or even a bit more, my official upload bandwidth is 7-10 Mbit/s)
The fluctuating upload speed are confirmed by the log (I added arrows to indicate the points where upload was slower than normal):
6 Dec 2017 23:06: put duplicati-if9b9be4b73cd4af9ac66243fd00e9ddf.dindex.zip.aes
->
6 Dec 2017 23:02: put duplicati-bbdad02aa72e34167a424cd7faa4b73de.dblock.zip.aes
6 Dec 2017 23:02: put duplicati-id6afd22d354546b298e3b44ff9134432.dindex.zip.aes
6 Dec 2017 23:01: put duplicati-b2991a82d96764f6db53a734a131edafd.dblock.zip.aes
6 Dec 2017 23:01: put duplicati-i25d84aedf0a84b2cad85cdb6e648f99e.dindex.zip.aes
6 Dec 2017 23:00: put duplicati-be2b64e4c60164538b2764dfb58f94987.dblock.zip.aes
6 Dec 2017 23:00: put duplicati-ib984699687144e89aca3a4b5665e5c36.dindex.zip.aes
6 Dec 2017 23:00: put duplicati-bbb354fa0f7d8442ab61be4c8446ea786.dblock.zip.aes
6 Dec 2017 23:00: put duplicati-i354c2cac48ec4f2e9882668f53d3fcae.dindex.zip.aes
->
6 Dec 2017 22:55: put duplicati-bdb80dade1b36436aa56cbae2ada15647.dblock.zip.aes
6 Dec 2017 22:55: put duplicati-i843810073d174e349ab9db4ff662d883.dindex.zip.aes
6 Dec 2017 22:55: put duplicati-ba85c5634af19497990cf59f3aef38fc0.dblock.zip.aes
6 Dec 2017 22:55: put duplicati-i88b41d08230647b18faf643aac11c15a.dindex.zip.aes
6 Dec 2017 22:54: put duplicati-i72323d96064d448189866f2e7c2f8fba.dindex.zip.aes
6 Dec 2017 22:53: put duplicati-b59225d9a300940a68c4d3a37eafc5f03.dblock.zip.aes
6 Dec 2017 22:53: put duplicati-i41f7bb906f0a450eba7636c93936c4cf.dindex.zip.aes
->
6 Dec 2017 22:48: put duplicati-b65ee652ea4224b44934326d6e0814ac2.dblock.zip.aes
6 Dec 2017 22:48: put duplicati-ia268213fa99c4fd89aaf91f028d766d7.dindex.zip.aes
->
6 Dec 2017 22:44: put duplicati-bd5fdb66f34dc49fc9a7ee0ef3b0b63d2.dblock.zip.aes
6 Dec 2017 22:44: put duplicati-i279159b340ed434093e82d7836e90559.dindex.zip.aes
6 Dec 2017 22:43: put duplicati-b4864404dbbba4f8d8e9331a5b4bb8034.dblock.zip.aes
6 Dec 2017 22:43: put duplicati-i847920daf5fa4299a0af224235295698.dindex.zip.aes
6 Dec 2017 22:42: put duplicati-bdc560d2e8ef047c0b9d550563099e17d.dblock.zip.aes
6 Dec 2017 22:42: put duplicati-i8507f061873148b5a8678c34b0dd79d9.dindex.zip.aes
6 Dec 2017 22:41: put duplicati-ba5da24b1f9e74331b6f0e085fb900ae8.dblock.zip.aes
6 Dec 2017 22:41: put duplicati-i89f66723789c49cc92e1fa46bfa48ed3.dindex.zip.aes
6 Dec 2017 22:40: put duplicati-b1418b3696b4d4c87b24a9181ec8fba56.dblock.zip.aes
6 Dec 2017 22:40: put duplicati-if3d07d5583da459f82674aec4369daf5.dindex.zip.aes
6 Dec 2017 22:39: put duplicati-b43954c8fda0d4f43b0691eeb55bf8ddb.dblock.zip.aes
6 Dec 2017 22:39: put duplicati-i5ebd967c14954331a3c03976cbd52b65.dindex.zip.aes
6 Dec 2017 22:38: put duplicati-b064f7c372491455d9ec5525447f15686.dblock.zip.aes
6 Dec 2017 22:38: put duplicati-i03c87ecdcda94282a6d817f4c2dc83ef.dindex.zip.aes
6 Dec 2017 22:36: put duplicati-b709be96c941048c78064500680c833ae.dblock.zip.aes
6 Dec 2017 22:36: put duplicati-i1ae5f7647ccc41599b3c53e6087fa341.dindex.zip.aes
->
6 Dec 2017 22:31: put duplicati-bae6b64d571584f21855c7f1355948f46.dblock.zip.aes
6 Dec 2017 22:31: put duplicati-i40c94937511d49ae825241a3b85f890a.dindex.zip.aes
6 Dec 2017 22:30: put duplicati-b0d8cc8a3c4c4479a97370bfb0d46ffe6.dblock.zip.aes
6 Dec 2017 22:30: put duplicati-i14fc671a7fa64c4d88537598081f0f99.dindex.zip.aes
->
6 Dec 2017 22:24: put duplicati-b425eb436ce6747a4a947510cb260177b.dblock.zip.aes
6 Dec 2017 22:24: put duplicati-i1789202e3227431f9aaac2d1ddc92f19.dindex.zip.aes
6 Dec 2017 22:23: put duplicati-b15bd3f7ebc8b4f47ba8c21d24356d06b.dblock.zip.aes
6 Dec 2017 22:23: put duplicati-i8746ce40c2e1480cb71b5300736ea414.dindex.zip.aes
6 Dec 2017 22:22: put duplicati-b9b6498988c36454faac170b7b98a0c68.dblock.zip.aes
6 Dec 2017 22:22: put duplicati-id2676ec56946427aa578a65772bd32ac.dindex.zip.aes
6 Dec 2017 22:21: put duplicati-bfd1ce9111425479983ea43e64b345c70.dblock.zip.aes
6 Dec 2017 22:21: put duplicati-idf9e4eb1d8934e29961c10322e7ebab8.dindex.zip.aes
pcloud support assured me that they are not doing any rate limiting whatsoever. It also doesn’t appear to be related to encryption or compression because CPU usage is low throughout and if duplicati were busy with creating the file*, I would expect upload to cease entirely, but there is constant upload activity. I have also verified that the during the low speed upload periods, it is actually duplicati uploading and not something else:
Swo what’s going on here? Why is the speed fluctuating so much? Should I complain to my ISP, or can it be duplicati that is causing this?