I install magento CE- 2.1.1 with sample data O.K working On centos 7 LAMP Server at localhost
I install magento CE-2.1.2 with sample data O.K not slowly working On centos 7 LAMP Server at localhost
I install magento 2-CE all of them until now but
I upgrade magento 2.1.1 to 2.1.2 no sample data I did but slowly
I upgrade magento 2.0.10 to 2.1.2 with sample data slowly working
after upgrade working slowly on Centos 7 LAMP server at localhost. because of this not hard woking on this versions
I suggest that you ask this question from Magento 2 subforum. While Magento 2 people occasionally also read Magento 1 topics, you're more likely to receive a relevant answer there.
If you want great experienced company for Magento 2 Upgrade and Data Migration. We have professional Magento developers, they well experience in Magento 2 theme design and development. They also proper assist to your Magento upgrade and e-commerce extensions. Our company gives quality Magento websites for small and large firms at best price.