[2022] War Thunders new Economy in one Picture

Hello

You appear to be using Rank III vehicles to research the Rank V Leopard 1. For more efficient research, you should be using Rank IV. If you were for example using the preceding vehicle in the same line (in this case Panther G), your research would be even higher.

For more details, you can check out our wiki

https://wiki.warthunder.com/Research_Points