When starting, the FPS will drop to 0 or 1 (even on superflat), and nearly impossible to play, but when pausing the game, it will show 15-25 FPS.
error:
.
[12:12:55 SEVERE]: Fatal error launching game. Report this to http://bugs.mojang.com please!
java.io.FileNotFoundException: File 'C:\Users\minec\AppData\Roaming\.minecraft\assets\indexes\legacy.json' does not exist
at org.apache.commons.io.FileUtils.openInputStream(FileUtils.java:299)
at org.apache.commons.io.FileUtils.readFileToString(FileUtils.java:1711)
at net.minecraft.launcher.Launcher.aE(Unknown Source)
at net.minecraft.launcher.Launcher.aK(Unknown Source)
at net.minecraft.launcher.game.a.B(Unknown Source)
at com.mojang.launcher.b.b.a.b(Unknown Source)
at com.mojang.launcher.updater.download.DownloadJob.popAndDownload(Unknown Source)
at com.mojang.launcher.updater.download.DownloadJob.access$0(Unknown Source)
at com.mojang.launcher.updater.download.DownloadJob$1.run(Unknown Source)
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
at java.util.concurrent.FutureTask.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
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The error message is MCL-1905, but unrelated to the FPS issue.
Your graphics card drivers are outdated, please update from http://downloadcenter.intel.com/
This is a technical support issue; this site is for bug reports only. For technical support please use the Mojang Support Center.

there where no updates for it. and minecraft did it well until december 25th

And what happened on December 25th ? Minecraft didn't change.