2017.3 Editor frame drop and movement reaction speed [ISSUE]

İ get a frame drops on editor (lights and effects off) and sometimes unity reacts my commands too slow. when I press alt+tab and reopen unity.
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another problem is, I push the wasd (movement) keys and editor scene stuck for 1 seconds and again moving. So I press “a” and “s” keys in order. and editor goes a little bit left and waiting 1 sec. and again going to the right.

Sometimes pressing “a” key and editor going to left, and I push “d” key (i still pushing “a” key)
editor going to left 2-3x faster
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I think we have an issue. And I didn’t get this problem’s on unity 2017.2 version (it’s not my pc fault)
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MY PC SPECS (HP Z420 WORKSTATİON)

CPU: Intel Xeon E5-1620 3.6GHz

GPU: Radeon HD 5450

RAM:8 GB DDR3

HDD: 1TB 7200 RPM HDD

OS: WİN 10 PRO 64 BİT

DX12

You should probably post this to the Unity forums. The devs don’t usually browse answers.