Hello Sagoun,
Quote: "...The problem is that when increasing the number of elements in the phase to be designed. Becomes to deal with the engine slowly, and increase slow everything has increased the number of items. Especially when the phase ends and works separately from the engine. Are there programs to help overcome this problem or is it must reduce the elements in the design stage. I'm new and I hope you can help"
I do not know if I understood your problem well, but I think you're having severe reduction in your frame rate per second (fps) after you add more entities in your game level scene.
If so, then the problem lies in the number of triangles or polygons in the scene I mean, the greater the amount of things (entities, static or dynamic one, segments, etc. ..) in your game scene the greater the amount of triangles or polygons in the scene which will require greater amount of mathematical calculations of the graphics processor (video board processor) to display all these images (polygons) at once on the scene.
Remember that, all images displayed on PC or laptop screen will demand some sort of mathematical calculations of the graphics processor.
If you try to reduce the number of entities in your game scene it will improve the game performance, especially if you have a PC or laptop without a greater power for graphics processing.
Nowadays the performance of the FPSC has improved greatly since its version 1.0 but you will soon discover that it has many problems still, including the performance issue as you have been experienced.
I hope this may help clarify a bit your question.
Cheers.
Northern