Slow range filter on String


The documents I have contain ids that are strings. I notice that doing range query of the form the_id >= X (where X is some input) can considerably slow down the query (the documents also have a timestamp; a filter of 'timetsamp between X and Y' works fine but a filter of the form 'timestamp between X and Y AND the_id>=X' is slow). Are there any performance optimizations (maybe not caching) that I can use to increase the speed?

Thanks for any help in advance,

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