Replacing ID with another will degrade performance in Solr?

I am using Solr 4.10.2. I have build indexed documents. In Schema.xml, I have removed ID field and replaced it with ngram field and made ngram field as unique key.

I have a question - when I will do search query on Solr. Will the performance of searching harm? And also it will affect Document caching.

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@Nitin Solanki What are the steps you used to switch from Lucene to Solr? 

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