Hi.

I'm trying to start Bitcoin Core (version 0.19.0.1) and let it synchronize
with the network, from scratch.

Operating System: Windows 10 64-bit
System Hardware Specs: Intel Core I5-2500K 3.3 GHz, primary memory 8 GB

The first 15 hours went relatively well. Perhaps more than 40% of the
blocks were downloaded. Peak download rate was about 45 Mbits/s.

After another 22 hours, the speed has sunk to 0.05% per hour, or
5 weeks estimated to complete, with 58% completed. This speed makes it
virtually useless.

Current CPU-usage is less than 1%, memory usage is 530 MB, disk usage is
0.4 MB/s and network usage is 0 MBits/s.

I tried to set the parameter dbcache=3000, but that didn't help. I also
removed the file peers.dat (those actions after normal shutdowns).

Here follow that last lines in debug.log:

2020-02-16T13:00:02Z Pre-allocating up to position 0xd00000 in rev01148.dat
2020-02-16T13:00:02Z UpdateTip: new best=00000000000000000046e3c526e9e6acc1e357dec1bffc092b0cbb0c0c18db35 height=505415 version=0x20000000 log2_work=87.930032 tx=294386471 date='2018-01-21T20:45:40Z' progress=0.582162 cache=202.8MiB(1545911txo)
2020-02-16T13:00:02Z socket sending timeout: 1298s
2020-02-16T13:00:02Z socket sending timeout: 1290s
2020-02-16T13:00:02Z socket sending timeout: 1290s
2020-02-16T13:00:02Z socket sending timeout: 1295s
2020-02-16T13:00:08Z New outbound peer connected: version: 70015, blocks=617634, peer=62 (full-relay)
2020-02-16T13:00:08Z Synchronizing blockheaders, height: 617634 (~100.00%)
2020-02-16T13:00:08Z New outbound peer connected: version: 70015, blocks=617634, peer=63 (full-relay)
2020-02-16T13:00:09Z New outbound peer connected: version: 70015, blocks=617634, peer=64 (full-relay)
2020-02-16T13:00:12Z Pre-allocating up to position 0x4000000 in blk01152.dat
2020-02-16T13:00:39Z UpdateTip: new best=0000000000000000005fb11ce1e189a6899923ef5dbfcbd42400d6e4bfd028bf height=505416 version=0x20000000 log2_work=87.930079 tx=294387632 date='2018-01-21T20:52:46Z' progress=0.582164 cache=203.3MiB(1549962txo)
2020-02-16T13:01:06Z UpdateTip: new best=000000000000000000093817c3777f1b2a695007563bf2224112bbcccc6bca01 height=505417 version=0x20000000 log2_work=87.930126 tx=294388417 date='2018-01-21T20:59:23Z' progress=0.582165 cache=203.6MiB(1552923txo)
2020-02-16T13:01:24Z UpdateTip: new best=000000000000000000051334104dcebb2c47e341a0f92061a92b9bb9f1313483 height=505418 version=0x20000000 log2_work=87.930173 tx=294390615 date='2018-01-21T21:45:41Z' progress=0.582170 cache=204.2MiB(1557523txo)
2020-02-16T13:02:15Z UpdateTip: new best=0000000000000000004e461f792190f663b649f6ce84d61094f86f961886330c height=505419 version=0x20000000 log2_work=87.93022 tx=294391606 date='2018-01-21T21:54:27Z' progress=0.582171 cache=205.0MiB(1563852txo)
2020-02-16T13:02:50Z UpdateTip: new best=0000000000000000005337c72e1bcd92bbf6e8e3f059098aaab1d1d65c03ee6e height=505420 version=0x20000000 log2_work=87.930266 tx=294393141 date='2018-01-21T21:55:38Z' progress=0.582174 cache=205.6MiB(1568735txo)
2020-02-16T13:03:13Z UpdateTip: new best=0000000000000000004896b4329ebf39cc10775e67a45b7ceaa9955a12442f76 height=505421 version=0x20000000 log2_work=87.930313 tx=294394825 date='2018-01-21T22:11:44Z' progress=0.582178 cache=205.9MiB(1571913txo)
2020-02-16T13:03:40Z UpdateTip: new best=00000000000000000038536500cfcd9bc04e9b5d450520486c302e0db262f214 height=505422 version=0x20000000 log2_work=87.93036 tx=294396622 date='2018-01-21T22:32:14Z' progress=0.582181 cache=206.5MiB(1576277txo)
2020-02-16T13:04:04Z Pre-allocating up to position 0xe00000 in rev01148.dat
2020-02-16T13:04:04Z UpdateTip: new best=00000000000000000016d527ae1047ba007d6ab87572dc345395e063871306c9 height=505423 version=0x20000000 log2_work=87.930407 tx=294397643 date='2018-01-21T22:32:52Z' progress=0.582183 cache=207.0MiB(1580736txo)
2020-02-16T13:04:34Z UpdateTip: new best=0000000000000000000314920673b219335e8133f9cfff93257f8532e2798052 height=505424 version=0x20000000 log2_work=87.930454 tx=294398329 date='2018-01-21T22:33:15Z' progress=0.582184 cache=207.2MiB(1582437txo)
2020-02-16T13:05:03Z UpdateTip: new best=000000000000000000088501c46a3078fd46847cfc4c2a7a47c5aa6c0a6d9adc height=505425 version=0x20000000 log2_work=87.9305 tx=294399362 date='2018-01-21T22:37:28Z' progress=0.582186 cache=207.6MiB(1585605txo)
2020-02-16T13:05:27Z UpdateTip: new best=00000000000000000078fa3303e12426de9df84e1ad088d1c74f80221bb4a404 height=505426 version=0x20000000 log2_work=87.930547 tx=294400698 date='2018-01-21T22:47:41Z' progress=0.582189 cache=208.1MiB(1589512txo)
2020-02-16T13:05:51Z UpdateTip: new best=000000000000000000390413e01dbf7461b5452357c221e7f828672ae6a5b374 height=505427 version=0x20000000 log2_work=87.930594 tx=294401691 date='2018-01-21T22:51:43Z' progress=0.582190 cache=208.7MiB(1594336txo)
2020-02-16T13:06:16Z UpdateTip: new best=0000000000000000006bdb4230790f2ab8640dc3f9de34e33a6e9641da1c7a7c height=505428 version=0x20000000 log2_work=87.930641 tx=294402393 date='2018-01-21T22:53:34Z' progress=0.582192 cache=209.2MiB(1598233txo)
2020-02-16T13:06:31Z Pre-allocating up to position 0xf00000 in rev01148.dat
2020-02-16T13:06:31Z UpdateTip: new best=0000000000000000007833ab6a5414dfcf4c5e03e2d1e0000f3f38ebd9443f71 height=505429 version=0x20000000 log2_work=87.930688 tx=294404248 date='2018-01-21T22:57:39Z' progress=0.582195 cache=209.5MiB(1601041txo)
2020-02-16T13:06:53Z UpdateTip: new best=0000000000000000004114f85c0781e9297edfb9e2302119326ce452eef51293 height=505430 version=0x20000000 log2_work=87.930734 tx=294405053 date='2018-01-21T23:00:53Z' progress=0.582197 cache=209.8MiB(1603160txo)

Thanks for any help.