This is the time of year when some pilots are fortunate enough to be flying in wave and along ridges, sometimes in challenging conditions and often at speed.
Of course all gliders have limitations including speed limits laid down by the designer, who will have used JAR-22 or more recently CS-22 as the basis of certification. Here’s an extract from CS-22 (also published in the BGA theory manual, Gliding, published 2002);
Please also remember that as the altitude increases, the difference between indicated airspeed and true airspeed increases resulting in misleading and potentially hazardous airspeed indication. A rule of thumb is to reduce a gliders Vne by 1.5% for every 1000′ above sea level. (BGA theory manual, Gliding, published 2002).