Left 4 Maps

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Hey,guys.I have a problem make me crazy.
I bought a new PC and it has a nice configuration. But... When I installed the hammer and make my map i found it's so terrible. For example, when I select a solid or entity object, it usually takes 2-3 seconds for the card to appear, or when I use the texture-tool, it takes 1-3 seconds for the result to appear. I am very upset about this and hope you guys can help me figure out a way.The problem i called it [ DELAY ].
What I have tried and what I can offer are as follows
1.there is no DELAY in a new map.
2.when I make my hammer vision very very low,it doesn't DELAY.
3.my cpu is amd r5-1600 ,gpu is rx570.
4.i tried to open the cpu performance of the panel while i run the hummer,i found the chart is keeping a low state.(3%-6%)
5.i tried overclocking my cpu to 3.9ghz,but has little effect.
6.i tried reinstall my l4d2 and hammer ,it has no effect.
It really gives me a headache, if someone can help just reply me,thanks so much!

hey guys I still have an unfinished version of the resident evil 1 courtyard map, it has been a while since i worked on it. anyone interessted in it?

New map I'm working on!

http://www.gamemaps.com/details/17584

ALERT !!!!!!!!!

http://park.l4dmods.com/
And i signal that IP sdress: 93.170.123.228 (Steam Outbound-Processus: L4D.exe) is suspected:
Scanning all Outbound Ports ........
ALERT !!!!!!!!!
I just detect HTMI: iframe-inf (Infection) on this Mods downloading adress:
http://park.l4dmods.com/ ........!!!!!!!!
Better go on:
http://www.gamemaps.com/l4d2/
http://l4dmapdb.com/tag:all
http://www.gamemaps.com
Or see my Groups List who gives Links and Secure Adresses !!!!!!.......

Hey everyone. 2019 II: Director's Cut has been released. Go check it out! http://www.gamemaps.com/details/12202