Mo Farah didn't make a huge jump in PRS, that is more myth/perception.
Mo Farah:
1500m progression
2017 3:34.19 Los Angeles, CA (USA) 18 MAY 2017
2016 3:31.74 Monaco (MON) 15 JUL 2016
2015 3:28.93 Monaco (MON) 17 JUL 2015
2013 3:28.81 Monaco (MON) 19 JUL 2013
2012 3:34.66 Los Angeles, CA (USA) 18 MAY 2012
2009 3:33.98 Monaco (MON) 28 JUL 2009
2008 3:39.66 Birmingham (GBR) 13 JUL 2008
2007 3:46.50 Birmingham (GBR) 07 JUL 2007
2006 3:38.02 Rieti (ITA) 27 AUG 2006
2005 3:38.62 Zürich (SUI) 19 AUG 2005
2003 3:43.17 Eton (GBR) 14 JUN 2003
2002 3:47.78 Watford (GBR) 28 AUG 2002
2001 3:46.41 Watford (GBR) 27 MAY 2001
2000 3:49.60
Mo Farah 3000m progression:
2017 7:35.15 London (GBR) 09 JUL 2017
2016 7:32.62 Birmingham (GBR) 05 JUN 2016
2015 7:34.66 London (GBR) 24 JUL 2015
2013 7:36.85 London (GBR) 27 JUL 2013
2011 7:40.15 London (GBR) 05 AUG 2011
2010 7:40.75 London (GBR) 13 AUG 2010
2009 7:39.02 Torino (ITA) 04 JUN 2009
2008 7:39.55 Monaco (MON) 29 JUL 2008
2007 7:41.86 Zürich (SUI) 07 SEP 2007
2006 7:38.15 Zagreb (CRO) 31 AUG 2006
2005 8:17.28 Firenze (ITA) 19 JUN 2005
2001 8:09.24 Loughborough (GBR) 20 MAY 2001
2000 8:03.58 Cardiff (GBR) 05 JUL 2000
1999 8:16.18 Neubrandenburg (GER) 21 AUG 1999
1998 8:33.51 Ayr (GBR) 18 JUL 1998
1997 8:47.48
Mo Farah 5000m progression:
2017 13:00.70 Eugene, OR (USA) 27 MAY 2017
2016 12:59.29 London (GBR) 23 JUL 2016
2015 13:11.77 Lausanne (SUI) 09 JUL 2015
2014 13:23.42 Portland, OR (USA) 15 JUN 2014
2013 13:05.88 Eugene, OR (USA) 01 JUN 2013
2012 12:56.98 Eugene, OR (USA) 02 JUN 2012
2011 12:53.11 Monaco (MON) 22 JUL 2011
2010 12:57.94 Zürich (SUI) 19 AUG 2010
2009 13:09.14 London (GBR) 24 JUL 2009
2008 13:08.11 Bruxelles (BEL) 05 SEP 2008
2007 13:07.00 Bruxelles (BEL) 14 SEP 2007
2006 13:09.40 Heusden-Zolder (BEL) 22 JUL 2006
2005 13:30.53 Solihull (GBR) 25 JUN 2005
2003 13:38.41 London (GBR) 08 AUG 2003
2001 13:56.31 Solihull (GBR) 23 JUN 2001
2000 14:05.72
https://www.iaaf.org/athletes/great-britain-ni/mohamed-farah-179892
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