I'm not trying to rain on your parade. In the end, one can believe whatever they want; either the performance speaks to you, or it doesn't. But there's plenty of written biographical material - eyewitness accounts - that can substantiate that Klemperer was literally falling asleep at some of his very last recording sessions. It may very well be that Klemp. meant the Mahler 7 just the way he recorded it. But in no way can I believe that he would have conducted it that way in his younger years. He was actually a very zippy conductor in earlier times. After all, Klemperer was at the world premiere in Prague. And while Mahler's own timings weren't super fast by any means (the ink was still wet, and the piece was notoriously difficult to perform), they nowhere approached the glacial timings of Klemperer's EMI recording. But hey, if you like it, you like it! I only responded because you asked the question; so I offered an opinion. The rest is up to you.