We only began to struggle in the mid 80s when the L.A. boycott severed a lot of athletic programmes among others. Seoul 1988 remains out worst post WWII Olympic performance (minus the Melbourne voyage in 1956). This stretched to the early 90s and we only began scoring good results since 1996. Before that we had Artur Partyka, Wanda Panfil and Robert Korzeniowski. Partyka's bronze in the high jump was the only medal we got in the 1992 Olympics, we had no medals at all in Seoul (6th in 4x100 wome relay was our best). Our best result at European Champs is 15 medals in 1966 at the height of the 'Wunderteam' years.
These junior results sometimes don't transfer to the seniors. Konrad Bukowiecki was labelled as the top junior in the world and now Haratyk has his measure and beyond. If three years ago anyone said Haratyk will be better than Bukowiecki you'd be laughed off and then some.